Qashqai J11. Security control system

P161D IMMOBILIZER

SEC-241

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

SEC

DTC/CIRCUIT DIAGNOSIS

P161D IMMOBILIZER

DTC Logic

INFOID:0000000010479737

DTC DETECTION LOGIC

POSSIBLE CAUSE

BCM

FAIL-SAFE

Inhibit engine cranking

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.

Check DTC in “Self Diagnostic Result”mode of “ENGINE”using CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-241, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479738

REPLACE BCM

Replace BCM. Refer to

BCS-135, "Removal and Installation"

>> INSPECTION END

DTC

CONSULT screen items

DTC detecting condition

P161D

IMMOBILIZER

When BCM detects an immobilizer malfunction and engine start is prohibited.

SEC-242

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

P161E IMMOBILIZER

P161E IMMOBILIZER

DTC Logic

INFOID:0000000010479739

DTC DETECTION LOGIC

POSSIBLE CAUSE

• BCM
• ECM

FAIL-SAFE

Inhibit engine cranking

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.

Check DTC in “Self Diagnostic Result”mode of “ENGINE” using CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-242, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479740

ECM REGISTRATION

Using CONSULT, register ECM.
Is the DTC detected?

YES

>> GO TO 2

>> INSPECTION END

REPLACE BCM

Replace BCM. Refer to

BCS-135, "Removal and Installation"

Is the DTC detected?

YES

>> GO TO 3

>> INSPECTION END

REPLACE ECM

Replace ECM.
Refer to the following procedure.
• HRA2DDT:

ECH-320, "Removal and Installation"

• K9K:

ECK-398, "Removal and Installation"

• R9M:

EC9-409, "Removal and Installation"

• MR16DDT:

ECM-616, "Removal and Installation"

• MR20DD:

ECM-1031, "Removal and Installation"

>> INSPECTION END

DTC

CONSULT screen items

DTC detecting condition

P161E

IMMOBILIZER

When CONSULT is not used during ECM replacement.

P161F IMMOBILIZER

SEC-243

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

SEC

P161F IMMOBILIZER

DTC Logic

INFOID:0000000010479741

DTC DETECTION LOGIC

POSSIBLE CAUSE

ECM

FAIL-SAFE

Inhibit engine cranking

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.

Check DTC in “Self Diagnostic Result”mode of “ENGINE”using CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-243, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479742

REPLACE ECM

Replace ECM.
Refer to the following procedure.
• HRA2DDT:

ECH-320, "Removal and Installation"

• K9K:

ECK-398, "Removal and Installation"

• R9M:

EC9-409, "Removal and Installation"

• MR16DDT:

ECM-616, "Removal and Installation"

• MR20DD:

ECM-1031, "Removal and Installation"

>> INSPECTION END

DTC

CONSULT screen items

DTC detecting condition

P161F

IMMOBILIZER

When BCM detects an immobilizer malfunction and engine start is prohib-
ited.

SEC-244

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

P1616 ECM

P1616 ECM

DTC Logic

INFOID:0000000010479743

DTC DETECTION LOGIC

POSSIBLE CAUSE

ECM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON and wait 2 seconds or more.

Check DTC in “Self Diagnostic Result”mode of “ENGINE”using CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-244, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479744

INSPECTION START

Turn ignition switch ON.

Select “Self Diagnostic Result” mode of “ENGINE” using CONSULT.

Touch “ERASE”.

Perform DTC CONFIRMATION PROCEDURE for DTC P1616. Refer to

SEC-244, "DTC Logic"

Is DTC P1616 displayed again?

YES

>> GO TO 2.

>> INSPECTION END

REPLACE ECM

Replace ECM.
Refer to the following procedure.
• HRA2DDT:

ECH-320, "Removal and Installation"

• K9K:

ECK-398, "Removal and Installation"

• R9M:

EC9-409, "Removal and Installation"

• MR16DDT:

ECM-616, "Removal and Installation"

• MR20DD:

ECM-1031, "Removal and Installation"

>> INSPECTION END

DTC No.

CONSULT screen items

DTC detecting condition

P1616

NATS MALFUNCTION

ECM ROM is malfunctioning

B2190 CHAIN OF BCM - IMM ANT

SEC-245

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

SEC

B2190 CHAIN OF BCM - IMM ANT

DTC Logic

INFOID:0000000010479745

DTC DETECTION LOGIC

POSSIBLE CAUSE

Keyfob

FAIL-SAFE

Security indicator lamp turn ON

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Make the conditions that BCM enters in the low power consumption mode (BCM sleep condition).
Refer to

BCS-17, "POWER CONSUMPTION CONTROL SYSTEM : System Description"

Turn ignition switch ON.

Check to DTC in “Self Diagnostic Result” mode of “BCM” CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-245, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479746

IGNITION KEY REGISTRATION

Using CONSULT, register all Ignition Keys again.

>> GO TO 2

PERFORM SELF-DIAGNOSIS RESULT

Select “Self Diagnosis Result” mode of “BCM” using CONSULT.

Erase DTC.

Perform DTC CONFIRMATION PROCEDURE for B2190. Refer to

SEC-245, "DTC Logic"

Is DTC detected?

YES

>> GO TO 3

>> INSPECTION END

CHECK NATS ANTENNA COMMUNICATION SIGNAL

Check voltage signal between NATS antenna amp. harness connector and ground using an oscilloscope.

Is the inspection result normal?

YES

>> Replace NATS antenna amp. Refer to

SEC-187, "Removal and Installation"

DTC

CONSULT screen items

DTC detecting condition

B2190–00

CHAIN OF BCM-IMM ANT

When BCM cannot detect the immobilizer ID in 0.6 seconds.

(+)

(-)

Condition

Voltage

NATS antenna amp.

Connector

Terminal

M45

Ground

Just after inserting igni-
tion key into key cylinder

Pointer of tester should move

Other than above

0 V

Just after inserting igni-
tion key into key cylinder

Pointer of tester should move

Other than above

0 V

SEC-246

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

B2190 CHAIN OF BCM - IMM ANT

>> GO TO 4

CHECK NATS ANTENNA COMMUNICATION SIGNAL CIRCUIT

Disconnect BCM connector and NATS antenna connector.

Check continuity between NATS antenna amp. harness connector and BCM harness connector.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5

>> Repair or replace harness.

REPLACE BCM

Replace BCM. Refer to

BCS-135, "Removal and Installation"

>> INSPECTION END

NATS antenna amp.

BCM

Continuity

Connector

Terminal

Connector

Terminal

M45

M69

113

Existed

109

BCM

Ground

Continuity

Connector

Terminal

M69

113

Not existed

109

B2191 ID DISCORD, BCM - IMM ANT

SEC-247

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

SEC

B2191 ID DISCORD, BCM - IMM ANT

DTC Logic

INFOID:0000000010479747

DTC DETECTION LOGIC

POSSIBLE CAUSE

Keyfob

FAIL-SAFE

Security indicator lamp turn ON

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.

Check to DTC in “Self Diagnostic Result” mode of “BCM” CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-247, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479748

IGNITION KEY REGISTRATION

Using CONSULT, register all Ignition Keys again.
Can engine be started with the registered Ignition Key?

YES

>> INSPECTION END

>> GO TO 2

REPLACE IGNITION KEY

Prepare Ignition Key that matches the vehicle.

Registration of all Ignition Key using CONSULT.

Can engine be started with the registered Ignition Key?

YES

>> INSPECTION END

>> GO TO 3

CHECK INTERMITTENT INCIDENT

Refer to

GI-44, "Intermittent Incident"

>> INSPECTION END

DTC

CONSULT screen items

DTC detecting condition

B2191–00

ID DISCORD, BCM-IMMANT

When BCM continuously cannot detect inconsistency of Immobilizer ID in
0.6 seconds or more.

SEC-248

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

B2192 ID DISCORD, IMMU-ECM

B2192 ID DISCORD, IMMU-ECM

DTC Logic

INFOID:0000000010479749

DTC DETECTION LOGIC

POSSIBLE CAUSE

• BCM
• ECM

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.

Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-248, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479750

PERFORM INITIALIZATION

Perform initialization of BCM and registration of all Intelligent Keys using CONSULT.
Can the system be initialized and can the engine be started with registered Intelligent Key?

YES

>> INSPECTION END

>> GO TO 2.

CHECK SELF DIAGNOSTIC RESULT

Select “Self Diagnostic Result” mode of “BCM” using CONSULT.

Erase DTC.

Perform DTC CONFIRMATION PROCEDURE for DTC B2192. Refer to

SEC-248, "DTC Logic"

Is DTC detected?

YES

>> GO TO 3.

>> INSPECTION END

REPLACE BCM

Replace BCM. Refer to

BCS-135, "Removal and Installation"

Perform initialization of BCM and registration of all Intelligent Keys using CONSULT.

Can the system be initialized and can the engine be started with registered Intelligent Key?

YES

>> INSPECTION END

>> GO TO 4.

REPLACE ECM

Replace ECM.
Refer to the following procedure.
• HRA2DDT:

ECH-320, "Removal and Installation"

• K9K:

ECK-398, "Removal and Installation"

• R9M:

EC9-409, "Removal and Installation"

• MR16DDT:

ECM-616, "Removal and Installation"

• MR20DD:

ECM-1031, "Removal and Installation"

DTC No.

CONSULT screen items

DTC detecting condition

B2192

ID DISCORD BCM-ECM

The ID verification results between BCM and ECM are NG.

SEC-250

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

B2193 CHAIN OF ECM-IMMU

B2193 CHAIN OF ECM-IMMU

DTC Logic

INFOID:0000000010479751

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors

(The CAN communication line is open or shorted.)

• BCM
• ECM

FAIL-SAFE

Inhibit engine cranking

DTC CONFIRMATION PROCEDURE

CHECK DTC PRIORITY

If DTC B2193 is displayed with DTC U1000 or U1010, first perform the trouble diagnosis for DTC U1000 or
U1010.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. U1000: Refer to

BCS-124, "DTC Description"

. U1010: Refer to

BCS-125, "DTC Description"

>> GO TO 2

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.

Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-250, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479752

CHECK DTC PRIORITY

If DTC B2193 is displayed with DTC U1000 or U1010, first perform the trouble diagnosis for DTC U1000 or
U1010.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. U1000: Refer to

BCS-124, "DTC Description"

. U1010: Refer to

BCS-125, "DTC Description"

>> GO TO 2

REPLACE BCM

Replace BCM. Refer to

BCS-135, "Removal and Installation"

Can the system be initialized and can the engine be started with registered Intelligent Key?

YES

>> INSPECTION END

>> GO TO 3.

REPLACE ECM

Replace ECM.
Refer to the following procedure.
• HRA2DDT:

ECH-320, "Removal and Installation"

• K9K:

ECK-398, "Removal and Installation"

• R9M:

EC9-409, "Removal and Installation"

DTC No.

CONSULT screen items

DTC detecting condition

B2193

CHAIN OF BCM-ECM

Inactive communication between BCM and ECM

B2193 CHAIN OF ECM-IMMU

SEC-251

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

SEC

• MR16DDT:

ECM-616, "Removal and Installation"

• MR20DD:

ECM-1031, "Removal and Installation"

>> INSPECTION END

SEC-252

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

B2195 ANTI-SCANNING

B2195 ANTI-SCANNING

DTC Logic

INFOID:0000000010479753

DTC DETECTION LOGIC

POSSIBLE CAUSE

ID verification request out of the specified specification

FAIL-SAFE

Inhibit engine cranking

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.

Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-252, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479754

CHECK SELF DIAGNOSTIC RESULT 1

Select “Self Diagnostic Result” mode of “BCM” using CONSULT.

Erase DTC.

Perform DTC CONFIRMATION PROCEDURE for DTC B2195. Refer to

SEC-252, "DTC Logic"

Is DTC detected?

YES

>> GO TO 2.

>> INSPECTION END

CHECK EQUIPMENT OF THE VEHICLE

Check that unspecified accessory part related to engine start is not installed.

Is unspecified accessory part related to engine start installed?

YES

>> GO TO 3.

>> GO TO 4.

CHECK SELF DIAGNOSTIC RESULT 2

Obtain the customers approval to remove unspecified accessory part related to engine start, and then
remove it.

Select “Self Diagnostic Result” of “BCM” using CONSULT.

Erase DTC.

Perform DTC CONFIRMATION PROCEDURE for DTC B2195. Refer to

SEC-252, "DTC Logic"

Is DTC detected?

YES

>> GO TO 4.

>> INSPECTION END

REPLACE BCM

Replace BCM. Refer to

BCS-135, "Removal and Installation"

>> INSPECTION END

DTC No.

CONSULT screen items

DTC detecting condition

B2195

ANTI-SCANNING

ID verification between BCM and ECM that is out of the specified
specification is detected.

B2196 DONGLE UNIT

SEC-253

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

SEC

B2196 DONGLE UNIT

Description

INFOID:0000000010479755

BCM performs ID verification between BCM and dongle unit.
When verification result is OK, BCM permits cranking.

DTC Logic

INFOID:0000000010479756

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors

(Dongle unit circuit is open or shorted.)

• Dongle unit

FAIL-SAFE

Inhibit engine cranking

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.

Turn ignition switch OFF.

Turn ignition switch ON.

Check DTC in Self-diagnosis result mode of BCM using CONSULT.

Is the DTC detected?

YES

>> Refer to

SEC-253, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479757

PERFORM INITIALIZATION

Perform initialization of BCM and registration of all mechanical keys using CONSULT.
For initialization and registration procedures, refer to CONSULT Immobilizer mode and follow the on-
screen instructions.

Start the engine.

Dose the engine start?

YES

>> INSPECTION END

>> GO TO 2.

CHECK DONGLE UNIT CIRCUIT

Turn ignition switch OFF.

Disconnect BCM connector and dongle unit connector.

Check continuity between BCM harness connector and dongle unit harness connector.

Check continuity between BCM harness connector and ground.

DTC No.

CONSULT screen items

DTC detecting condition

B2196

DONGLE NG

The ID verification results between BCM and dongle unit is invalid.

BCM

Dongle unit

Continuity

Connector

Terminal

Connector

Terminal

M70

M24

Existed

SEC-254

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

B2196 DONGLE UNIT

Is the inspection result normal?

YES

>> GO TO 3.

>> Repair or replace harness.

CHECK DONGLE UNIT GROUND CIRCUIT

Check continuity between dongle unit harness connector and ground.

Is the inspection result normal?

YES

>> Replace dongle unit.

>> Repair or replace harness.

BCM

Ground

Continuity

Connector

Terminal

M70

Not existed

Dongle unit

Ground

Continuity

Connector

Terminal

M24

Existed

B2198 NATS ANTENNA AMP.

SEC-255

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

SEC

B2198 NATS ANTENNA AMP.

DTC Logic

INFOID:0000000010479758

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors

(NATS antenna amp. circuit is open or shorted.)

• NATS antenna amp.
• IPDM E/R

FAIL-SAFE

Inhibit engine cranking

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Make the conditions that BCM enters in the low power consumption mode (BCM sleep condition).
Refer to

BCS-17, "POWER CONSUMPTION CONTROL SYSTEM : System Description"

Turn ignition switch ON.

Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES

>> Refer to

SEC-255, "Diagnosis Procedure"

NO-1

>> To check malfunction symptom before repair: Refer to

GI-44, "Intermittent Incident"

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010479759

CHECK NATS ANTENNA AMP. POWER SUPPLY

Disconnect NATS antenna amp.connector.

Check voltage between NATS antenna amp. harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4

>> GO TO 2

CHECK FUSE

Turn ignition switch OFF.

Check that the following fuse in fuse block (J/B) is not blown.

Is the inspection result normal?

YES

>> GO TO 3

>> Replace the blown fuse after repairing the cause of blowing.

CHECK NATS ANTENNA AMP. POWER SUPPLY CIRCUIT

Disconnect fuse block (J/B) connector.

DTC No.

CONSULT screen items

DTC detecting condition

B2198

NATS ANTENNA AMP.

Inactive communication between NATS antenna amp. and BCM

NATS antenna amp.

(-)

voltage

Connector

Terminal

M45

Ground

Battery voltage

Signal name

Fuse No

Battery voltage

25 (5A)

SEC-256

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT INTELLIGENT KEY SYSTEM]

B2198 NATS ANTENNA AMP.

Check continuity between NATS antenna amp. harness connector and fuse block (J/B) harness connec-
tor.

Check continuity between NATS antenna amp. harness connector and ground.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-44, "Intermittent Incident"

>> Repair or replace harness.

CHECK NATS ANTENNA AMP. GROUND CIRCUIT

Check continuity between NATS antenna amp. harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

>> Repair or replace harness.

CHECK NATS ANTENNA AMP. COMMUNICATION SIGNAL

Check voltage signal between NATS antenna amp. harness connector and ground using an oscilloscope.

Is the inspection result normal?

YES

>> Replace NATS antenna amp. Refer to

SEC-187, "Removal and Installation"

>> GO TO 6.

CHECK NATS ANTENNA AMP. COMMUNICATION SIGNAL CIRCUIT

Disconnect BCM connector.

Check continuity between NATS antenna amp. harness connector and BCM harness connector.

Check continuity between BCM harness connector and ground.

NATS antenna amp.

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

M45

M77

12C

Existed

NATS antenna amp.

Ground

Continuity

Connector

Terminal

Not existed

M45

NATS antenna amp.

Ground

Continuity

Connector

Terminal

Existed

M45

(+)

(–)

Condition

Voltage (V)

NATS antenna amp.

Connector

Terminal

M45

Ground

Just after inserting ignition key into
key cylinder

Pointer of tester should move

Other than above

0 V

Just after inserting ignition key into
key cylinder

Pointer of tester should move

Other than above

0 V

NATS antenna amp.

BCM

Continuity

Connector

Terminal

Connector

Terminal

M45

M69

113

Existed

109

Qashqai J11. Security control system - part 16