Content .. 580 581 582 583 ..

Jeep XJ. Manual - part 582

Symptom:

*BRAKE LAMP SWITCH

POSSIBLE CAUSES

CHECK BRAKE LAMP SWITCH OUTPUT

BRAKE LAMP SWITCH B+ OPEN

BRAKE LAMP SWITCH OUTPUT CIRCUIT SHORT OR OPEN

BRAKE LAMP SWITCH OPEN

CAB -- INTERNAL OPEN

TEST

ACTION

APPLICABILITY

With the DRBIII

t in Inputs/Outputs, read the Brake Lamp Switch state.

Press and release the brake pedal.
Does the DRBIII

t display PRESSED and RELEASED?

All

Yes

→

The Brake Lamp Switch is OK.
Perform ABS VERIFICATION TEST - VER 1.

→

Go To

Disconnect the Brake Lamp Switch harness connector.
Using a 12-volt test light connected to ground, check the Brake Lamp Switch Fused
B+ circuit.
Does the test light illuminate brightly ?

All

Yes

→

Go To

→

Repair the Brake Lamp Switch Fused B+ circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.

Disconnect the Brake Lamp Switch harness connector.
Connect a jumper wire between the Brake Lamp Switch B+ and Output circuits.
With the DRBIII

t in Inputs/Outputs, read the Brake Lamp Switch state.

Does the DRBIII

t display PRESSED?

All

Yes

→

Replace the Brake Lamp Switch in accordance with the Service
Information.
Perform ABS VERIFICATION TEST - VER 1.

→

Go To

Disconnect the CAB harness connector.
Disconnect the Brake Lamp Switch harness connector.
Check the Brake Lamp Switch Output circuit for a short to voltage and an open.
Is the Brake Lamp Switch Output circuit shorted or open?

All

Yes

→

Repair the Brake Lamp Switch Output circuit for a short to
voltage or an open.
Perform ABS VERIFICATION TEST - VER 1.

→

Replace the Controller Anti-Lock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.

BRAKES (CAB)

Symptom:

*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE

POSSIBLE CAUSES

ATTEMPT TO COMMUNICATE WITH THE PCM

CHECK FUSE #25 IN JUNCTION BLOCK

OPEN GROUND CIRCUITS

OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT

SCI TRANSMIT CIRCUIT OPEN

CONTROLLER ANTILOCK BRAKE

TEST

ACTION

APPLICABILITY

Turn the ignition on.
With the DRB attempt to communicate with the PCM.
Was the DRB able to communicate with the PCM?

All

Yes

→

Go To

→

Refer to symptom list for problems related to No Response From
PCM.
Perform BODY VERIFICATION TEST - VER 1.

Turn the ignition off.
Remove and inspect fuse #25 in the Junction Block.
Is the fuse open?

All

Yes

→

Refer to the wiring diagrams located in the service information to
help isolate a possible short to ground.
Perform BODY VERIFICATION TEST - VER 1.

→

Go To

Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between ground and each ground circuit (cavs 8 and 24).
Is the resistance below 5.0 ohms for each measurement?

All

Yes

→

Go To

→

Repair the ground circuit that measured above 5.0 ohms for an
open.
Perform BODY VERIFICATION TEST - VER 1.

Turn the ignition off.
NOTE: Ensure fuse #25 is installed in the Junction Block.
Disconnect the CAB harness connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?

All

Yes

→

Go To

→

Repair the Fused Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.

COMMUNICATION

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance of the SCI Transmit circuit between the CAB connector and
the DLC.
Is the resistance below 5.0 ohms?

All

Yes

→

Go To

→

Repair the SCI Transmit circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.

If there are no possible causes remaining, view repair.

All

Repair

Replace the Controller Antilock Brake.
Perform BODY VERIFICATION TEST - VER 1.

COMMUNICATION

*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE —

Continued

Verification Tests

ABS VERIFICATION TEST - VER 1

APPLICABILITY

1. Turn the ignition off.
2. Connect all previously disconnected components and connectors.
3. Ensure all accessories are turned off and the battery is fully charged.
4. Ensure that the Ignition is on, and with the DRBIII, erase all Diagnostic Trouble Codes from
ALL modules. Start the engine and allow it to run for 2 minutes and fully operate the system
that was malfunctioning.
5. Turn the ignition off and wait 5 seconds. Turn the ignition on and using the DRBIII, read
DTC’s from ALL modules.
6. If any Diagnostic Trouble Codes are present, return to Symptom list and troubleshoot new
or recurring symptom.
7. If there are no DTC’s present after turning ignition on, road test the vehicle for at least 5
minutes. Perform several antilock braking stops.
8. Caution: Ensure braking capability is available before road testing.
9. Again, with the DRBIII

t read DTC’s. If any DTC’s are present, return to Symptom list.

10. If there are no Diagnostic Trouble Codes (DTC’s) present, and the customer’s concern can
no longer be duplicated, the repair is complete.
Are any DTC’s present or is the original concern still present?

All

Yes

→

Repair is not complete, refer to appropriate symptom.

→

Repair is complete.

BODY VERIFICATION TEST - VER 1

APPLICABILITY

1. Disconnect all jumper wires and reconnect all previously disconnected components and
connectors.
2. If the Sentry Key Immobilizer Module (SKIM) or the Powertrain Control Module (PCM) were
replaced, proceed to number 4. If the SKIM or PCM were not replaced, continue to the next
number.
3. If the Remote Keyless Entry module was replaced, using the DRBIII

t select 9Theft Alarm9

9VTSS9 9Miscellaneous9 and 9Program RKE9. Program all transmitters used with this vehicle.
Proceed to number 11.
4. Obtain the Vehicle’s unique PIN number assigned to it’s original SKIM module from either
the vehicle’s invoice or from Chrysler’s Customer Center (1-800-992-1997).
5. With the DRBIII, select THEFT ALARM, SKIM, MISCELLANEOUS and select

9Skim

Module Replaced

9 function. Enter the 4 digit PIN number to put SKIM in 9Access Mode9.

6. The DRBIII will prompt you through the following steps. (1) Program the country code into
the SKIM’s memory. (2) Program the vehicle’s VIN number into the SKIM’s memory. (3)
Transfer the vehicle’s Secret Key data from the PCM.
7. Once secured access mode is active, the SKIM will remain in that mode for 60 seconds.
8. Using the DRBIII, program all customer keys into the SKIM’s memory. This requires that
the SKIM be in secured access mode, using the 4 digit code.
9. Note: If the PCM is replaced, the unique Secret Key data must be transferred from the SKIM to the
PCM. This procedure requires the SKIM to be placed in secured access mode using the 4-digit code.
10. Note: If 3 attempts are made to enter secured access mode using an incorrect PIN, secured access mode
will be locked out for 1 hour which causes the DRB III to display

9Bus +\- Signals Open9. To exit this mode,

turn ignition to the

9Run9 pos. for 1 hour.

11. Ensure all accessories are turned off and the battery is fully charged.
12. Ensure that the Ignition is on, and with the DRBIII

t, erase all Diagnostic Trouble Codes from ALL

modules. Start the engine and allow it to run for 2 minutes and fully operate the system that was
malfunctioning.
13. Turn the ignition off and wait 5 seconds. Turn the ignition on and using the DRBIII

t, read DTC’s from

ALL modules.
Are any DTC’s present or is the original complaint still present?

All

Yes

→

Repair is not complete, refer to appropriate symptom.

→

Repair is complete.

VERIFICATION TESTS

Content .. 580 581 582 583 ..