Dodge Viper SRT-10 (ZB). Manual - part 330

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Ensure that the A/C - Heater Control C2 harness connector is connected to the A/C
- Heater Control Module.
Turn the ignition on.
With the DRBIII

t in HVAC, System Tests, actuate the Actuator Circuit Test.

What message does the DRBIII

t display?

All

Same msg as from start of test

Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.

Different msg than from start of test

Using the wiring diagram as a guide, inspect the wiring &
connectors for conditions causing an intermittent short that set
the original test msg. Repair as necessary. If DRB displays a msg
for a different door driver ckt, return to Test 1 of this Symptom.
Perform BODY VERIFICATION TEST - VER 1.

213

HEATING & A/C

ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE —

Continued

Symptom:

BACKLIGHT DIMMING RX FAILURE (ACTIVE)

When Monitored and Set Condition:

BACKLIGHT DIMMING RX FAILURE (ACTIVE)

When Monitored:

With the ignition on.

Set Condition:

If the A/C - Heater Control Module does not receive the dimming function

message from the Body Control Module for more than 5 seconds, then the A/C - Heater
Control Module backlighting will default to full brightness and the DTC will set.

POSSIBLE CAUSES

DIMMING MESSAGE NOT SEEN AT RATE EXPECTED

A/C - HEATER CONTROL MODULE

BODY CONTROL MODULE - NO DIM MESSAGE TO A/C - HEATER CONTROL MODULE

TEST

ACTION

APPLICABILITY

NOTE: Make sure that the Panel Dimmer switch is not in set in Funeral
Mode.
Turn the ignition on.
Turn the Blower control to low speed.
Press the A/C switch on.
Press the EBL switch on.
Watch the A/C and EBL status indicators on the A/C-Heater Control Module while
turning the Headlamp switch on and then off.
Did the status indicators dim when the Headlamp switch was turned on?

All

Yes

→ No problem found at this time.

Perform BODY VERIFICATION TEST - VER 1.

→ Go To 2

Turn the ignition on.
With the DRBIII

t in Monitor Display, PCI Bus Messages, look for the VF DIM Msg

Present.
Does the DRB display: VF DIM Msg present: Yes?

All

Yes

→ Replace the A/C - Heater Control Module in accordance with the

Service Information.
Perform BODY VERIFICATION TEST - VER 1.

→ Replace the Body Control Module in accordance with the Service

Information.
Perform BODY VERIFICATION TEST - VER 1.

214

HEATING & A/C

Symptom List:

BLEND CALIBRATION FAULT
MODE 1 CALIBRATION FAULT
MODE 2 CALIBRATION FAULT
RECIRCULATION CALIBRATION FAULT

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be BLEND CALIBRATION FAULT.

When Monitored and Set Condition:

BLEND CALIBRATION FAULT

When Monitored:

When the HVAC Door Recalibration is executed.

Set Condition:

If the blend door’s span is found outside the tolerance due to: open door

actuator electrical circuits; a bad door actuator; broken door linkage; a bound up door; door
actuator electrical circuits shorted to voltage; door actuator electrical circuits shorted to
ground. A short to voltage or ground on the door actuator electrical circuits will also set
door actuator overcurrent faults.

MODE 1 CALIBRATION FAULT

When Monitored:

When the HVAC Door Recalibration is executed.

Set Condition:

If the Mode 1 door’s span is found outside the tolerance due to: open door

MODE 2 CALIBRATION FAULT

When Monitored:

When the HVAC Door Recalibration is executed.

Set Condition:

If the Mode 2 door’s span is found outside the tolerance due to: open door

RECIRCULATION CALIBRATION FAULT

When Monitored:

When the HVAC Door Recalibration is executed.

Set Condition:

If the recirculation door’s span is found outside the tolerance due to: open

door actuator electrical circuits; a bad door actuator; broken door linkage; a bound up door;
door actuator electrical circuits shorted to voltage; door actuator electrical circuits shorted
to ground. A short to voltage or ground on the door actuator electrical circuits will also set
door actuator overcurrent faults.

215

HEATING & A/C

POSSIBLE CAUSES

CHECK FOR ACTUATOR CIRCUIT TEST FAULT MESSAGES

CHECK FOR HVAC DTCS

DOOR ACTUATOR DRIVER CIRCUIT OPEN

COMMON DOOR DRIVER CIRCUIT OPEN

DOOR ACTUATOR

DOOR ACTUATOR/LINKAGE/DOOR

A/C - HEATER CONTROL MODULE

TEST

ACTION

APPLICABILITY

NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must
be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the DRBIII

t in HVAC, System Tests, actuate the Actuator Circuit Test.

Does the DRBIII

t display any Actuator Circuit Test fault messages?

All

Yes

→ Return to the symptom list and choose the symptom(s).

Perform BODY VERIFICATION TEST - VER 1.

→ Go To 2

NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must
be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the DRBIII

t, read HVAC DTCs.

Does the DRBIII

t display any HVAC DTCs?

All

Yes

→ Return to the symptom list and choose the symptom(s).

Perform BODY VERIFICATION TEST - VER 1.

→ Go To 3

Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Measure the resistance between the Common Door Driver circuit and the applicable
door driver circuit.
Is the resistance above 70.0 ohms?

All

Yes

→ Go To 4

→ Go To 6

Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the applicable door actuator harness connector.
Measure the resistance of the applicable door driver circuit between the A/C - Heater
Control Module C2 harness connector and the door actuator harness connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 5

→ Repair the applicable door driver circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

216

HEATING & A/C

BLEND CALIBRATION FAULT —

Continued

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