Chrysler Town, Dodge Caravan. Manual - part 703

Symptom:

CLUSTER MESSAGE MISMATCH

When Monitored and Set Condition:

CLUSTER MESSAGE MISMATCH

When Monitored:

After the MIC bulb test is completed, the ACM compares the Lamp

Request by ACM, On or Off, and the Lamp on by MIC, On or Off, PCI Bus messages. Each
message is transmitted one time per second or when a change in the lamp state occur.

Set Condition:

If the Lamp Request by ACM, On or Off, and the Lamp on by MIC, On or

Off, messages do not match, the code will set.

POSSIBLE CAUSES

MIC DIAGNOSTIC CODES

CLUSTER MESSAGE MISMATCH

STORED CODE OR INTERMITTENT CONDITION

ACM, CLUSTER MESSAGE MISMATCH

ACTIVE CODE PRESENT

TEST

ACTION

APPLICABILITY

Turn the ignition on.
Ensure the battery is fully charged.
NOTE: For the purpose of this test, the AECM and ORC modules will be
referred to as an ACM.
SELECT ACTIVE or STORED DTC:

All

ACM - ACTIVE DTC

Go To

ACM - STORED DTC

Go To

NOTE: When reconnecting Airbag system components, the ignition must be
turned off and the battery must be disconnected.

Turn the ignition on.
With the DRBIII

t, read the MIC DTCs.

Does the DRBIII

t display any active Diagnostic Codes?

All

Yes

→ Refer to symptom list for problems related to Instrument Cluster.

→ Go To 3

AIRBAG

TEST

ACTION

APPLICABILITY

With the DRBIII

t select PASSIVE RESTRAINTS, AIRBAG, MONITOR DISPLAY

and WARNING LAMP STATUS.
Cycle the ignition key and observe the LAMP ON BY MIC and LAMP REQ BY ACM
monitors after the 6 to 8 second indicator test.
Does the LAMP ON BY MIC and LAMP REQ BY ACM monitors match?

All

YES

Go To

Replace Mechanical Instrument Cluster.
Perform AIRBAG VERIFICATION TEST - VER 1.

WARNING: MAKE SURE THE BATTERY IS DISCONNECTED, THEN WAIT
TWO MINUTES BEFORE PROCEEDING.
If there are no possible causes remaining, view repair.

All

Repair

Replace the Airbag Control Module in accordance with Service
Instructions. WARNING: IF THE AIRBAG CONTROL MODULE
IS DROPPED AT ANY TIME, IT MUST BE REPLACED.
Perform AIRBAG VERIFICATION TEST - VER 1.

With the DRBIII

t, record and erase all DTC’s from all Airbag modules.

If equipped with Passenger Airbag On - Off switch, read the DTC’s in all switch
positions.
If any ACTIVE codes are present they must be resolved before diagnosing any stored
codes.
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Look for chaffed, pierced, pinched, or partially broken wires and broken, bent, pushed
out, spread, corroded, or contaminated terminals.
The following additional checks may assist you in identifying a possible intermittent
problem.
Reconnect any disconnected components and harness connector.
WARNING: TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
With the DRBIII

t monitor active codes as you work through the following steps.

WARNING: MAINTAIN A SAFE DISTANCE FROM ALL AIRBAGS WHILE
PERFORMING THE FOLLOWING STEPS.
Wiggle the wiring harness and connectors of the related airbag circuit or component.
If codes are related to the Driver circuits, rotate the steering wheel from stop to stop.
You have just attempted to simulate the condition that initially set the trouble code
message.
Did the DTC become active?

All

Yes

→ Select appropriate symptom from Symptom List.

→ No problem found at this time. Erase all codes before returning

vehicle to customer.

AIRBAG

CLUSTER MESSAGE MISMATCH —

Continued

Symptom:

DRIVER SEAT BELT SWITCH CIRCUIT OPEN

When Monitored and Set Condition:

DRIVER SEAT BELT SWITCH CIRCUIT OPEN

When Monitored:

With the ignition on the ACM monitors the Seat Belt Switch circuit for

an open condition.

Set Condition:

The code will set if the ACM does not detect the correct circuit voltage.

POSSIBLE CAUSES

DRIVER SEAT BELT SWITCH OPEN

DRIVER SEAT BELT SWITCH CIRCUITS OPEN

ACM, DRIVER SEAT BELT SWITCH CIRCUIT OPEN

STORED CODE OR INTERMITTENT CONDITION

ACTIVE CODE PRESENT

TEST

ACTION

APPLICABILITY

Turn the ignition on.
NOTE: Ensure the battery is fully charged.
NOTE: For the purpose of this test, the AECM and ORC modules will be
referred to as an ACM.
SELECT ACTIVE or STORED DTC:

All

ACM - ACTIVE DTC

Go To

ACM - STORED DTC

Go To

NOTE: When reconnecting Airbag system components, the ignition must be
turned off and the battery must be disconnected.

Turn the ignition off.
Disconnect the Driver Seat Belt Switch.
NOTE: Check connectors - Clean and repair as necessary.
Turn the ignition on.
Measure the voltage between Driver Seat Belt Switch Line 1 and Line 2 circuits at
the SBS connector.
Is there any voltage present?

All

Yes

→ Replace the Driver Seat Belt Switch Buckle Assembly.

Perform AIRBAG VERIFICATION TEST - VER 1.

→ Go To 3

AIRBAG

TEST

ACTION

APPLICABILITY

WARNING: TURN IGNITION OFF, DISCONNECT THE BATTERY AND WAIT
TWO MINUTES BEFORE PROCEEDING.
Disconnect the Airbag Control Module connector(s).
NOTE: Check connectors - Clean and repair as necessary.
Connect the appropriate Load Tool Adaptor to the Airbag Control Module connector.
Measure the resistance of the Driver SBS Line 1 and line 2 circuits between the
Driver SBS harness connector and Airbag Load Tool adaptor.
Is the resistance of both circuits below 10K ohms?

All

Yes

→ Replace the Airbag Control Module in accordance with the Service

information. WARNING: IF THE AIRBAG CONTROL MODULE
IS DROPPED AT ANY TIME, IT MUST BE REPLACED. MUST
BE REPLACED.
Perform AIRBAG VERIFICATION TEST - VER 1.

→ Repair the open Driver Seat Belt Switch Line 1 or Line 2.

Perform AIRBAG VERIFICATION TEST - VER 1.

With the DRBIII

t, record and erase all DTC’s from all Airbag modules.

t monitor active codes as you work through the following steps.

All

Yes

→ Select appropriate symptom from Symptom List.

→ No problem found at this time. Erase all codes before returning

vehicle to customer.

AIRBAG

DRIVER SEAT BELT SWITCH CIRCUIT OPEN —

Continued

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