Chrysler Town, Dodge Caravan. Manual - part 721

TEST

ACTION

APPLICABILITY

With the DRB select ENGINE, MISCELLANEOUS, SELECT MISC FUNCTION,
and then CHECK VIN to read the Vehicle Identification Number in the Powertrain
Control Module.
Compare the VIN displayed on the DRB screen and the Vehicle VIN plate.
Does the VIN plate and the PCM VIN match?

All

Yes

→ Go To 4

→ Replace the Powertrain Control Module and program with the

correct vehicle identification number.
Perform AIRBAG VERIFICATION TEST - VER 1.

WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE SIDE IMPACT AIRBAG CONTROL MODULE IS
DROPPED AT ANY TIME, IT MUST BE REPLACED.
If there are no possible causes remaining, view repair.

All

Repair

WARNING: MAKE SURE THE BATTERY IS DISCONNECTED,
THEN WAIT TWO MINUTES BEFORE PROCEEDING. Replace
the Side Impact Airbag Control Module in accordance with Service
Instructions.
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.

120

AIRBAG

NO PCM MESSAGE —

Continued

Symptom:

NO RIGHT SIACM MESSAGE

When Monitored and Set Condition:

NO RIGHT SIACM MESSAGE

When Monitored:

With ignition on, the ACM monitors the PCI Bus for the Right Side

Impact Airbag Control Module status message. The Right SIACM transmits the status
message to the ACM at 1 - second intervals.

Set Condition:

If the ACM fails to see the Right SIACM status message on the PCI Bus

for 15 seconds.

POSSIBLE CAUSES

NO RIGHT SIACM MESSAGE

ACM, NO RIGHT SIACM MESSAGE

STORED CODE OR INTERMITTENT CONDITION

ACTIVE CODE PRESENT

TEST

ACTION

APPLICABILITY

NOTE: Ensure the battery is fully charged.
Turn the ignition on.
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.

With the DRBIII

t select SIDE AIRBAG and the RIGHT SIDE AIRBAG from the

DRBIII

t menu.

Does the DRBIII

t show NO RESPONSE or BUS +/- SIGNAL OPEN?

All

Yes

→ Refer to the COMMUNICATION category for the related symp-

tom.
Perform AIRBAG VERIFICATION TEST - VER 1.

→ Go To 3

121

AIRBAG

TEST

ACTION

APPLICABILITY

WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
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.

NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.

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.

122

AIRBAG

NO RIGHT SIACM MESSAGE —

Continued

Symptom:

PASSENGER SEAT BELT SWITCH CIRCUIT OPEN

When Monitored and Set Condition:

PASSENGER SEAT BELT SWITCH CIRCUIT OPEN

When Monitored:

The ACM monitors the Seat Belt Buckle Switch circuit for an open

condition.

Set Condition:

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

POSSIBLE CAUSES

PASSENGER SBS OPEN

PASSENGER SEAT BELT SWITCH CIRCUITS OPEN

ACM, PASSENGER 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 Passenger Seat Belt Switch.
NOTE: Check connectors - Clean and repair as necessary.
Turn the ignition on.
Measure the voltage between Passenger Seat Belt Switch Line 1 and Line 2 circuits
and ground.
Is there voltage present on both circuits?

All

Yes

→ Replace the Passenger Seat Belt Switch Buckle Assembly.

Perform AIRBAG VERIFICATION TEST - VER 1.

→ Go To 3

123

AIRBAG

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