Jeep Wrangler TJ. Manual — part 33
TEST
ACTION
APPLICABILITY
9
Turn the ignition off.
Disconnect the Instrument Cluster C2 connector.
Disconnect the Rear Window Defogger Switch connector.
Turn the ignition on.
Measure voltage between the Rear Window Defogger Switch Sense Circuit and
ground.
Is any voltage present?
All
Yes
→ Repair the Rear Window Switch Sense Circuit for a short to
voltage condition.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 10
10
Turn the ignition off.
Disconnect the Instrument Cluster C2 connector.
Disconnect the Rear Window Defogger Switch connector.
Measure resistance between ground and the Rear Window Defogger Switch Sense
Circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Rear Window Defogger Switch Sense Circuit for a
short to ground condition.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 11
11
Turn the ignition off.
Disconnect the Instrument Cluster C2 connector.
Disconnect the Rear Window Defogger Switch.
Measure resistance of the Rear Window Defogger Switch Sense circuit from the
Instrument Cluster C2 connector to the Defogger switch connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 12
No
→ Repair the Rear Window Defogger Switch Sense Circuit for an
open condition.
Perform BODY VERIFICATION TEST - VER 1.
12
Turn the ignition off.
Reinstall the Rear Window Defogger Relay.
Reconnect the Instrument Cluster C2 connector.
Disconnect the Rear Window Defogger Switch connector.
Turn the ignition on.
Connect a jumper wire between the Rear Window Defogger Switch Sense circuit in
the Defogger Switch connector to ground and listen for the relay to click.
Does the Defogger Relay click?
All
Yes
→ Replace the Rear Window Defogger Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
129
ELECTRICALLY HEATED SYSTEMS
*REAR WINDOW DEFOGGER INOPERATIVE —
Continued
Symptom:
*REAR WINDOW DEFOGGER SWITCH INDICATOR LAMP INOP-
ERATIVE
POSSIBLE CAUSES
FUSED REAR WINDOW DEFOGGER RELAY OUTPUT CKT SHORTED TO GROUND
FUSE BLOCK FUSE #17
FUSED REAR WINDOW DEFOGGER RELAY OUTPUT CKT OPEN
DEFOGGER SWITCH
TEST
ACTION
APPLICABILITY
1
Inspect Fuse Block fuse #17.
Is Fuse Block fuse #17 open?
All
Yes
→ Go To 2
No
→ Go To 3
2
Turn the ignition off.
Disconnect the Rear Defogger Switch.
Measure resistance of the Fused Rear Window Defogger Relay Output circuit to
ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Fused Rear Window Defogger Relay Output circuit for
a short to ground condition.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace Fuse Block fuse #17.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the Rear Defogger Switch.
Remove the Rear Window Defogger Relay.
Ensure that Fuse Block fuse #17 is installed.
Measure resistance of the Fused Rear Window Defogger Relay Output circuit from
the relay output terminal to the Defogger Switch connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Rear Window Defogger Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Fused Rear Window Defogger Relay Output circuit for
an open condition.
Perform BODY VERIFICATION TEST - VER 1.
130
ELECTRICALLY HEATED SYSTEMS
Symptom:
ACM MESSAGE NOT REC’D BY MIC
When Monitored and Set Condition:
ACM MESSAGE NOT REC’D BY MIC
When Monitored:
With the ignition in the Run/Start position, Instrument Cluster in
power-up state.
Set Condition:
The Instrument Cluster detects loss of communication with the Air Bag
Control Module (ACM).
POSSIBLE CAUSES
ACM MESSAGE NOT RECEIVED
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: Ensure the Instrument Cluster communicates on the PCI Bus.
With the DRBIII
t, select Body, Electro/Mech Cluster, then read DTCs.
Does the DRBIII
t display ACM Message Not Rec’d by MIC?
All
Yes
→ Refer to the COMMUNICATION category and perform the ap-
propriate symptom.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
131
INSTRUMENT CLUSTER
Symptom:
AIR BAG LAMP CIRCUIT OPEN
When Monitored and Set Condition:
AIR BAG LAMP CIRCUIT OPEN
When Monitored:
With the ignition in the Run/Start position, Instrument Cluster in
power-up state.
Set Condition:
The Instrument Cluster performs an indicator check when the indicator is
commanded on or off by the ACM. If an open lamp failure is detected, the Cluster sends this
meesage 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 indicator status to the ACM on the PCI Bus.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display Air Bag Lamp Circuit Open?
All
Yes
→ Replace and configure the Instrument Cluster in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
132
INSTRUMENT CLUSTER
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