Chrysler Town, Dodge Caravan. Manual — part 721
TEST
ACTION
APPLICABILITY
3
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
No
→ Replace the Powertrain Control Module and program with the
correct vehicle identification number.
Perform AIRBAG VERIFICATION TEST - VER 1.
4
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.
5
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
→ 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
1
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
ACM - STORED DTC
NOTE: When reconnecting Airbag system components, the ignition must be
turned off and the battery must be disconnected.
2
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.
No
→ Go To 3
121
AIRBAG
TEST
ACTION
APPLICABILITY
3
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.
4
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
→ 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
1
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
ACM - STORED DTC
NOTE: When reconnecting Airbag system components, the ignition must be
turned off and the battery must be disconnected.
2
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.
No
→ Go To 3
123
AIRBAG
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