Jeep Wrangler TJ. Manual — part 38
Symptom:
*AXLE LOCK INDICATOR PROBLEMS
POSSIBLE CAUSES
DTC PRESENT
AXLE LOCKER SWITCH FUSED B(+) CIRCUIT OPEN
AXLE LOCKER SWITCH GROUND CIRCUIT OPEN
FRONT LOCKER REQUEST CIRCUIT OPEN
REAR LOCKER REQUEST CIRCUIT OPEN
AXLE LOCK SWITCH
INTERMITTENT CONDITION
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
NOTE: The following tests are to diagnose an inoperative Axle Lock indica-
tor. If the Axle Lock indicator flashes, the Enable conditions have not been
met to lock the axle, or an axle mechanical fault exists.
NOTE: The Front Axle Lock and Rear Axle Lock indicators can NOT be
diagnosed using the Instrument Cluster self test.
With the DRBIII
t, read DTCs.
Are any ABS, PCM, VSS, or Transfer Case DTCs present?
All
Yes
→ Refer to DRIVEABILITY or TRANSMISSION/TRANSFER CASE
information for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Select the inoperative indicator.
All
Rear Axle Lock Indicator
Front Axle Lock Indicator
3
Perform the Axle Locker test.
Turn the ignition on.
Place transfer case in 4WD Lo and visually confirm by observing the 4WD indicator.
Drive the vehicle at less than 10 MPH (16 km/h).
Press the Axle Lock switch once.
Did the Rear Axle Lock indicator illuminate?
All
Yes
→ The condition 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 inspect
the related wiring harness and connector terminals.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
149
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
4
Place the transfer case in 4WD Lo.
Drive the vehicle at less than 2.5 MPH (4 km/h).
With the DRBIII
t in Inputs/Outputs, read the Enable 1 state, (should read LOW).
With the DRBIII
t in Inputs/Outputs, read the Rear Lock Request state.
Press the Axle Lock switch once.
Did the Rear Lock Request change state?
All
Yes
→ Replace and configure the Instrument Cluster in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Axle Lock Switch harness connector.
Measure the voltage between the Fused B(+) circuit and ground.
Is the voltage below 10.5 volts?
All
Yes
→ Repair the Axle Locker Switch Fused B(+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the Axle Lock Switch harness connector.
Measure the resistance between ground and the Axle Locker Switch Ground circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Axle Locker Switch Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the Axle Locker Switch harness connector.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance of the Rear Locker Request circuit between the Axle Locker
Switch connector and the Instrument Cluster C1 connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Rear Locker Request circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Axle Lock Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
150
INSTRUMENT CLUSTER
*AXLE LOCK INDICATOR PROBLEMS —
Continued
TEST
ACTION
APPLICABILITY
8
Place transfer case in 4WD Lo and drive vehicle at less than 2.5 MPH (4 km/h).
Press the Axle Locker Switch once to lock the rear axle.
With the DRBIII
t in Inputs/Outputs, ensure that the Enable 1 and Enable 2 states
both read LOW.
With the DRBIII
t in Inputs/Outputs, ensure that the Rear Lock Request and Rear
Lock Return states both read LOCKED.
Press the Axle Locker Switch again.
Did the Front Axle Lock indicator illuminate?
All
Yes
→ The condition 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 inspect
the related wiring harness and connector terminals.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 9
9
Place the vehicle in 4WD Lo, operate vehicle at 2.5 MPH (4 km/h) or less.
With the DRBIII
t in Inputs/Outputs, ensure that the Enable 1 and Enable 2 states
read LOW.
The Rear Axle Lock indicator must be illuminated.
With the DRBIII
t in Inputs/Outputs, read the Front Lock Request state.
Press the Axle Locker Switch.
Did the Front Axle Lock Request change state?
All
Yes
→ Replace and configure the Instrument Cluster in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 10
10
Turn the ignition off.
Disconnect the Axle Locker Switch harness connector.
Disconnect the Instrument Cluster C2 harness connector.
Measure the resistance of the Front Locker Request circuit between the Axle Locker
Switch connector and the Instrument Cluster C2 connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Front Locker Request circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Axle Lock Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
151
INSTRUMENT CLUSTER
*AXLE LOCK INDICATOR PROBLEMS —
Continued
Symptom:
*BRAKE WARNING INDICATOR ALWAYS ON
POSSIBLE CAUSES
BRAKE WARNING INDICATOR CIRCUIT SHORT TO GROUND
BRAKE WARNING INDICATOR SWITCH
PARK BRAKE SWITCH
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure that the Base brake system functions properly and that the
Brake Master Cylinder is filled with proper amount of fluid.
NOTE: If equipped, diagnose and repair any ABS DTCs before continuing
with this test.
Turn the ignition off.
Disconnect the Park Brake Switch harness connector.
Turn the ignition on and observe the Brake Warning Indicator.
Does the Brake Warning Indicator remain illuminated?
All
Yes
→ Go To 2
No
→ Replace the Park Brake Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Brake Warning Indicator Switch harness connector.
Connect a jumper wire between cavity 1 and cavity 2.
Turn the ignition on and observe the Brake Warning Indicator.
Does the Brake Warning Indicator remain illuminated?
All
Yes
→ Repair the Brake Warning Indicator circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Brake Warning Indicator Switch in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
152
INSTRUMENT CLUSTER
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