Toyota Sequoia (2005). Manual - part 445

DID50–01

C00083

DLC3

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

DI–1575

1769

DIAGNOSIS SYSTEM

1.

DIAGNOSIS SYSTEM

(a)

Inspect the battery voltage.
Battery voltage: 11 to 14 V

If voltage is below 11 V, recharge the battery before proceeding.
(b)

Check the DLC3.
The transponder key ECU uses ISO 9141–2 for commu-
nication. The terminal arrangement of the DLC3 complies
with SAE J1962 and matches the ISO 9141–2 format.

DID51–01

A04550

CG

OP3

DLC3

1 2 3 4 5 6 7 8

9 1011 13 1516

12 14

TC

I28427

Security Indicator
Light

MIL

BR3904

Normal System Code

0.25 Sec.

0.25 Sec.

I02680

Diagnostic Trouble Code (Example Code 12, 99)

0.5 Sec. 0.5 Sec.

1.5 Sec. 2.5 Sec.

One Cycle

4.5 Sec.

Repeat

DI–1576

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

1770

DTC CHECK / CLEAR

1.

INSPECT DIAGNOSIS

(a)

Check the DTC using SST check wire.
(1)

Turn the ignition switch ON, but do not start the en-
gine.

(2)

When checking DTC 99: Using SST, connect termi-
nals 13 (TC) and 4 (CG) of the DLC3.

(3)

When checking codes except DTC 99: Using SST,
connect terminals 8 (OP3) and 4 (CG) of the DLC3.

SST

09843–18040

(4)

Read the DTC indicated by the number of times the
security indicator light or the MIL blinks.

HINT:

If no DTC is output, inspect the diagnosis circuits (OP3
and TC) and the security indicator light circuit (See page

DI–1597

, 

DI–1567

, 

DI–1599

).

If the system is operating normally, the light blinks twice
per second.

As an example, the blinking patterns of the normal system
code and trouble codes 12 and 99 are shown on the left
and below.

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

DI–1577

1771

(5)

When DTC ”99” is output, there is a problem with the
immobiliser. Start troubleshooting referring to the
PROBLEM SYMPTOMS TABLE.

(6)

After completing the check, disconnect terminals 8
(OP3) and 4 (CG), or terminals 13 (TC) and 4 (CG),
and turn off the display.

HINT:
If 2 or more trouble codes exist, indication will begin from the
lowest numbered code.
(b)

Clear the DTC.
(1)

When using diagnosis check wire:

Remove the ECU–B fuse and EFI No. 2 fuse from
the engine room J/B for 1 minute or more.

DI1AM–35

DI–1578

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

1772

DIAGNOSTIC TROUBLE CODE CHART

ECM DIAGNOSTIC TROUBLE CODE CHART (MIL)

DTC No.

(See page)

Detection Item

Trouble Area

99

(

DI–1580

)

Engine immobiliser system malfunction

Transponder key ECU

ECM

Wire harness

TRANSPONDER KEY ECU DIAGNOSTIC TROUBLE CODE CHART (SECURITY INDICATOR LIGHT)

DTC No.

(See page)

Detection Item

Trouble Area

11

(

DI–1582

)

Code 11 is not output

Unlock warning switch

Transponder key ECU

Wire harness

12

(

DI–1585

)

Code 12 is not output

Driver door courtesy lamp switch

Transponder key ECU

Body ECU

Wire harness

13

(

DI–1587

)

Code 13 is not output

Ignition  switch

Transponder key ECU

Wire harness

21, 22

(

DI–1589

)

Code 21 or 22 is not output

Key

Transponder key ECU

Transponder key amplifier with key coil

Wire harness

31, 35, 36, 37

(

DI–1592

)

Code 31, 35, 36 or 37 is output

Key

32, 33

(

DI–1593

)

Code 32 or 33 is output

Key

Transponder key ECU

Wire harness

34

Code 34 is output

Transponder key ECU has no memory space to register anoth-

er key code

HINT:

DTCs 11, 12, 13, 21 and 22 are normal codes.

As for the normal codes, if the corresponding DTC is not output while operating any of the components
listed under ”Trouble Area”, perform the inspection described in the reference pages.

DTCs 31, 32, 33, 34, 35, 36, 37 and 99 are abnormal codes.