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Jeep Wrangler TJ. Manual - part 5

TEST

ACTION

APPLICABILITY

With the DRBIII

t, ensure PCI Bus communications with the Instrument Cluster.

Is the Instrument Cluster communicating on the PCI Bus?

All

Yes

→ Go To 3

→ Refer to category COMMUNICATION CATEGORY and select the

related symptom NO RESPONSE or INSTRUMENT CLUSTER
BUS +/- SIGNAL OPEN.
Perform __AIRBAG VERIFICATION TEST - VER 1.

With the DRBIII

t select PASSIVE RESTRAINTS, AIRBAG and MONITOR DIS-

PLAY.
Using the DRBIII

t, read the WARNING LAMP MONITOR screen.

Select the LAMP STATUS displayed on the DRB monitors screen.
Observe the Lamp Driver State and Actual Lamp State.
Is the LAMP DRIVER and ACTUAL LAMP STATE: OK?

All

YES

Go To

Replace Instrument Cluster.
Perform __AIRBAG VERIFICATION TEST - VER 1.

WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BE-
FORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY
TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND PERSONAL INJURY OR DEATH.
If there are no possible causes remaining, view repair.

All

Repair

Replace the Airbag Control Module in accordance with Service
Instructions.
Perform __AIRBAG VERIFICATION TEST - VER 1.

AIRBAG

AIRBAG WARNING INDICATOR OPEN —

Continued

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: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BE-
FORE 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: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION ON, THEN RECONNECT THE BATTERY.
With the DRBIII

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

WARNING: TO AVOID PERSONAL INJURY OR DEATH, 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 Airbag circuits, rotate the steering wheel from stop
to stop.
IF only stored codes return continue the test until the problem area has been isolated
In the previous steps you have attempted to recreate the conditions responsible for
setting active DTC in question.
Are any ACTIVE DTCs present?

All

Yes

→ Select appropriate symptom from Symptom List.

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

vehicle to customer.

AIRBAG

AIRBAG WARNING INDICATOR OPEN —

Continued

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.

Perform __AIRBAG VERIFICATION TEST - VER 1.

→ 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: TO AVOID PERSONAL INJURY OR DEATH, DISCONNECT THE
BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY
TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND PERSONAL INJURY OR DEATH.
If there are no possible causes remaining, view repair.

All

Repair

Replace the 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.

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

CLUSTER MESSAGE MISMATCH —

Continued

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