Jeep Wrangler TJ. Manual — part 34
Symptom:
AIR BAG LAMP CIRCUIT SHORT
When Monitored and Set Condition:
AIR BAG LAMP CIRCUIT SHORT
When Monitored:
With the ignition in the Run/Start position, the Instrument Cluster in
power-up state.
Set Condition:
The Instrument Cluster performs an indicator check when the indicator is
commanded on by the ACM. If a shorted lamp failure is detected, the Cluster sends this
message to the ACM.
POSSIBLE CAUSES
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: Ensure the Instrument Cluster and the Air Bag Control Module
communicate on the PCI Bus.
NOTE: The Airbag indicator can only be turned on or off by the ACM. The
Instrument Cluster reports the status of the indicator to the ACM on the PCI
Bus.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display Air Bag Lamp Circuit Shorted?
All
Yes
→ Replace and configure the Instrument Cluster in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
133
INSTRUMENT CLUSTER
Symptom:
CHECKSUM FAILURE
When Monitored and Set Condition:
CHECKSUM FAILURE
When Monitored:
Instrument Cluster detects battery connection.
Set Condition:
Instrument Cluster fails EEPROM checksum test. (The Instrument
Cluster performs an EEPROM checksum as a continuous self test to verify functionality.)
POSSIBLE CAUSES
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, select Body, then Electro/Mech Cluster, read DTCs.
Does the DRBIII
t display Checksum Failure?
All
Yes
→ Replace and configure the Instrument Cluster in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
134
INSTRUMENT CLUSTER
Symptom:
PANEL DIMMER OPEN
When Monitored and Set Condition:
PANEL DIMMER OPEN
When Monitored:
The Instrument Cluster detects battery voltage input on the Headlamp
Switch Output circuit.
Set Condition:
The Instrument Cluster detects the Panel Lamp Dimmer Signal circuit
resistance is greater than 9250 ohms for five seconds. During an open circuit condition, the
VF display and general panel illumination will default to full intensity.
POSSIBLE CAUSES
INTERMITTENT CONDITION
PANEL LAMP DIMMER SIGNAL CIRCUIT OPEN
MULTI-FUNCTION SWITCH
MULTI-FUNCTION SWITCH GROUND CIRCUIT OPEN
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, erase DTCs.
Cycle the ignition.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display Panel Dimmer Open?
All
Yes
→ Go To 2
No
→ The conditon is not present at this time. Monitor DRBIIIt
parameters while wiggling the related wire harness. Refer to any
Technical Service Bulletins (TSB) that may apply. Visually in-
spect the related wiring harness and connector terminals.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Disconnect the Multi-Function Switch harness connector.
Check connectors - Clean/repair as necessary.
Measure the resistance of the Panel Lamp Dimmer Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 3
No
→ Repair the Panel Lamp Dimmer Signal circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
135
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Multi-Function Switch harness connector.
Check connectors - Clean/repair as necessary.
Measure the resistance of the Multi-Function Switch between terminal pin 7 and
terminal pin 8.
Does the resistance measure above 9250 ohms?
All
Yes
→ Replace the Multi-Function Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Multi-Function Switch harness connector.
Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Multi-Function Switch 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 Multi-Function Switch Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
136
INSTRUMENT CLUSTER
PANEL DIMMER OPEN —
Continued
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