Chrysler Town, Dodge Caravan. Manual - part 719

Symptom:

NO LEFT SIACM MESSAGE

When Monitored and Set Condition:

NO LEFT SIACM MESSAGE

When Monitored:

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

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

Set Condition:

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

15 seconds.

POSSIBLE CAUSES

NO LEFT SIACM MESSAGE

ACM, NO LEFT 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 PASSIVE RESTRAINTS, SIDE AIRBAG then LEFT SIDE

from the DRB menu.
Does the DRBIII

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

All

Yes

→ Refer to the Communication category for the related symptom.

Perform AIRBAG VERIFICATION TEST - VER 1.

→ Go To 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.

112

AIRBAG

TEST

ACTION

APPLICABILITY

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.

113

AIRBAG

NO LEFT SIACM MESSAGE —

Continued

Symptom:

NO ODOMETER MESSAGE

When Monitored and Set Condition:

NO ODOMETER MESSAGE

When Monitored:

With ignition on, the ACM monitors the PCI Bus for the Odometer

message from the Body Control Module. The PCM transmits the odometer message at 1
second intervals.

Set Condition:

The code will set, if the ACM does not see the odometer message for 10

seconds.

POSSIBLE CAUSES

PCM, PCI COMMUNICATION FAILURE

NO ODOMETER MESSAGE

STORED CODE OR INTERMITTENT CONDITION

ACM, NO ODOMETER MESSAGE

ACTIVE CODE PRESENT

TEST

ACTION

APPLICABILITY

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

Connect the DRBIII

t to the data link connector and select PASSIVE RESTRAINTS,

AIRBAG, SYSTEM TEST.
With the DRBIII

t, read the PCM Active on the Bus:.

Does the DRB show PCM ACTIVE ON THE BUS?

All

Yes

→ Go To 3

→ Refer to category 9 COMMUNICATION CATEGORY9 and select

the related symptom.
Perform AIRBAG VERIFICATION TEST - VER 1.

114

AIRBAG

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 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 and wait 2
minutes before proceeding. Replace the Airbag Control Module in
accordance with Service Instructions.
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.

115

AIRBAG

NO ODOMETER MESSAGE —

Continued

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