Jeep Wrangler TJ. Manual — part 37
Symptom:
*AIR BAG INDICATOR INOPERATIVE
POSSIBLE CAUSES
INSTRUMENT CLUSTER
AIR BAG INDICATOR DTC
TEST
ACTION
APPLICABILITY
1
NOTE: The Instrument Cluster Air Bag Indicator will not illuminate during
the cluster Self Test. The indicator is controlled by PCI Bus messages
received from the Air Bag Control Module (ACM).
NOTE: The ACM will command the indicator on when the ignition is cycled
to the Run/Start position.
With the DRBIII
t, select Body, then MIC, read DTCs.
Does the DRBIII
t display Air Bag Lamp Open or Air Bag Lamp Shorted?
All
Yes
→ Refer to the Service Information and perform the appropriate
symptom.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Instrument Cluster in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
145
INSTRUMENT CLUSTER
Symptom:
*ALL GAUGES INOPERATIVE
POSSIBLE CAUSES
NO RESPONSE - PCI BUS
NO RESPONSE - PCI BUS - INSTRUMENT CLUSTER
NO RESPONSE - PCI BUS - POWERTRAIN CONTROL MODULE
FUSED IGNITION SWITCH OUTPUT CIRCUIT SHORT TO GROUND
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
GROUND CIRCUIT OPEN
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, select System Monitors, then J1850 Module Scan.
Does the DRBIII
t display MIC PRESENT on the BUS?
All
Yes
→ Go To 2
No
→ Refer to the COMMUNICATION category and perform the appro-
priate symptom.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition on.
With the DRBIII
t, select Body, MIC, MODULE DISPLAY.
Does the DRBIII
t display NO RESPONSE from MIC?
All
Yes
→ Refer to symptom *NO CLUSTER BUS MESSAGE in the Com-
munication category.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition on.
With the DRBIII
t, select Body, MIC, SYSTEM TESTS, PCM Monitor.
Does the DRBIII
t display PCM INACTIVE ON THE BUS?
All
Yes
→ Refer to the symptom list for problems related to *NO RE-
SPONSE FROM THE POWERTRAIN CONTROL MODULE.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
146
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Inspect the #10 Fuse in the Fuse Block.
If the fuse is open, replace with proper rated fuse.
Turn the ignition on for one minute.
Turn the ignition off.
Inspect the #10 Fuse in the Fuse Block.
Is the fuse open?
All
Yes
→ Repair the Fused Ignition Switch Output circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage between the Fused Ignition Switch Output circuit and ground.
Is the voltage above 10.5 volts?
All
Yes
→ Go To 6
No
→ Repair the Fused Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Instrument Cluster Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace and configure the Instrument Cluster in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Instrument Cluster Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
147
INSTRUMENT CLUSTER
*ALL GAUGES INOPERATIVE —
Continued
Symptom:
*ANY PCI BUS INDICATOR INOPERATIVE
POSSIBLE CAUSES
NO RESPONSE - PCI BUS
NO RESPONSE - INSTRUMENT CLUSTER
NO RESPONSE - POWERTRAIN CONTROL MODULE
INOPERATIVE INDICATOR
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, select System Monitors, then J1850 Module Scan.
Does the DRBIII
t display MIC PRESENT on the Bus?
All
Yes
→ Go To 2
No
→ Refer to the COMMUNICATION category and perform the appro-
priate symptom.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition on.
With the DRBIII
t, Select Body, MIC, then MODULE DISPLAY.
Does the DRBIII
t display NO RESPONSE from MIC?
All
Yes
→ Refer to the symptom list for problems related to *NO RE-
SPONSE FROM THE INSTRUMENT CLUSTER
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition on.
With the DRBIII
t, select Body, MIC, SYSTEM TESTS, PCM MONITOR.
Does the DRBIII
t display PCM INACTIVE on the BUS?
All
Yes
→ Refer to the symptom list for problems related to *NO RE-
SPONSE FROM THE POWERTRAIN CONTROL MODULE
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
NOTE: Diagnose and repair any PCM DTCs before proceeding with this test.
Perform the Instrument Cluster Self Test.
Observe the indicator in question during the Self Test.
Did the indicator illuminate?
All
Yes
→ Refer to the appropriate Service Information category to diagnose
the related system.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Instrument Cluster in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
148
INSTRUMENT CLUSTER
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