Chrysler Town, Dodge Caravan. Manual - part 716

TEST

ACTION

APPLICABILITY

Gain access to the connectors on the bottom of the IPM.
Disconnect the IPM C7 connector.
NOTE: Check connectors - Clean and repair as necessary.
Measure the resistance of the SIACM Run - Start Driver circuit between the IPM C7
connector and the Right SIACM connectors.
Is the resistance below 1.0 ohms?

All

Yes

→ Replace the IPM.

Perform AIRBAG VERIFICATION TEST - VER 1.

→ Repair the open SIACM Run - Start Driver circuit.

Perform AIRBAG VERIFICATION TEST - VER 1.

Measure the battery voltage.
Is the voltage above 30.0 volts?

All

Yes

→ Refer to Charging Category for the P1594 Charging System Too

High symptom.
Perform AIRBAG VERIFICATION TEST - VER 1.

→ Replace the Front Control Module.

Perform AIRBAG VERIFICATION TEST - VER 1.

WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
Disconnect the Front Control Module.
NOTE: Check connectors - Clean and repair as necessary.
Measure the resistance of the SIACM Run-Start Driver circuit between the Front
Control Module connector and ground.
Is the resistance below 500K ohms?

All

Yes

→ Go To 17

→ Replace the Front Control Module.

Perform AIRBAG VERIFICATION TEST - VER 1.

All

Yes

→ Go To 18

→ Replace the IPM.

Perform AIRBAG VERIFICATION TEST - VER 1.

WARNING: IF THE SIDE IMPACT AIRBAG CONTROL MODULE IS
DROPPED AT ANY TIME, IT MUST BE REPLACED.
Disconnect the Left Side Impact Airbag Control Module.
NOTE: Check connectors - Clean and repair as necessary.
Measure the resistance of the SIACM Run - Start Driver circuit between the FCM
connector and ground.
Is the resistance below 500K ohms?

All

Yes

→ Go To 19

→ Replace the Left Side Impact Airbag Control Module..

Perform AIRBAG VERIFICATION TEST - VER 1.

100

AIRBAG

LOSS OF IGNITION RUN - START —

Continued

TEST

ACTION

APPLICABILITY

WARNING: IF THE SIDE IMPACT AIRBAG CONTROL MODULE IS
DROPPED AT ANY TIME, IT MUST BE REPLACED.
Disconnect the Right Side Impact Airbag Control Module.
NOTE: Check connectors - Clean and repair as necessary.
Measure the resistance of the SIACM Run - Start Driver circuit between the FCM
connector and ground.
Is the resistance below 500K ohms?

All

Yes

→ Repair the shorted SIACM Run - Start Driver circuit.

Perform AIRBAG VERIFICATION TEST - VER 1.

→ Replace the Right Side Impact Airbag Control Module in accor-

dance with Service Instructions. WARNING: make sure the
battery is disconnected and wait 2 minutes before proceeding.
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.

101

AIRBAG

LOSS OF IGNITION RUN - START —

Continued

Symptom List:

LOSS OF IGNITION RUN ONLY
ORC RUN ONLY DRIVER OPEN
ORC RUN ONLY DRIVER OVER CURRENT
ORC RUN ONLY DRIVER OVER TEMP
ORC RUN ONLY DRIVER OVER VOLT
ORC RUN ONLY DRIVER SHORT TO GROUND

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be RUN ONLY CIRCUIT TEST.

When Monitored and Set Condition:

LOSS OF IGNITION RUN ONLY

When Monitored:

With the ignition in the run only position the ORC monitors the ORC

Run Only Driver circuit for proper system voltage.

Set Condition:

If the voltage on the ORC Run Only Driver circuit drops below 4.5 volts,

the code will set.

ORC RUN ONLY DRIVER OPEN

When Monitored:

When the ignition is turned OFF, the microprocessor controlled

transistor (high side driver) places a diagnostic voltage on the ORC Run Only circuit for 60
seconds. An open high side driver (HSD) circuit voltage is between 2.4 and 5.0 volts.

Set Condition:

This code will set within 10 second, if the microprocessor senses 2.4 to 5.0

volts on the HSD. Note: the diagnostic voltage will only last for 60 seconds after the
ignition is turned off.

ORC RUN ONLY DRIVER OVER CURRENT

When Monitored:

The FCM uses a microprocessor controlled transistor (high side driver)

to supply power to the ORC. The microprocessor monitors the high side driver (HSD)
internal temperature when the ignition is in the Run position.

Set Condition:

The code will set within 1 second, if the microprocessor senses high HSD

internal temperature. The high temperature is caused by over current.

ORC RUN ONLY DRIVER OVER TEMP

When Monitored:

When the ignition is turned OFF, the microprocessor controlled

transistor (high side driver) places a diagnostic voltage on the ORC Run Only circuit for 60
seconds. An open high side driver (HSD) circuit voltage is between 2.4 and 5.0 volts.

Set Condition:

This code will set within 10 second, if the microprocessor senses 2.4 to 5.0

volts on the HSD. Note: the diagnostic voltage will only last for 60 seconds after the
ignition is turned off.

102

AIRBAG

ORC RUN ONLY DRIVER OVER VOLT

When Monitored:

The FCM uses a microprocessor controlled transistor (high side driver)

to supply power to the ORC. The microprocessor monitors the high side driver (HSD)
battery voltage when the ignition is in the Run position.

Set Condition:

The code will set if the microprocessor senses HSD battery voltage is over

30 volts.

ORC RUN ONLY DRIVER SHORT TO GROUND

When Monitored:

The FCM uses a microprocessor controlled transistor (high side driver)

to supply power to the ORC. The microprocessor monitors the high side driver (HSD)
circuit for short to ground when the ignition is in the Run position.

Set Condition:

The code will set within 1 second, if the microprocessor senses high HSD

internal temperature. The high temperature is caused by short to ground.

POSSIBLE CAUSES

ACM, LOSS OF IGNITION RUN ONLY

ACM, ORC RUN ONLY CIRCUIT OPEN

FCM, ORC RUN ONLY CIRCUIT OPEN

IPM, ORC RUN ONLY CIRCUIT OPEN

ORC RUN ONLY DRIVER CIRCUIT OPEN

FCM, ORC RUN ONLY CIRCUIT SHORT

IPM, ORC RUN ONLY CIRCUIT SHORT

ACM, ORC RUN ONLY CIRCUIT SHORT

ORC RUN ONLY CIRCUIT SHORT

HIGH BATTERY VOLTAGE

ORC RUN ONLY OVER VOLTAGE

STORED CODE OR INTERMITTENT CONDITION

ACTIVE CODE PRESENT

103

AIRBAG

LOSS OF IGNITION RUN ONLY —

Continued

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