Cherokee 2WD L6-4.0L VIN S (1998)
Four-Wheel Drive (4WD) Indicator Lamp: Testing and Inspection
The diagnosis found here addresses an inoperative four-wheel drive indicator lamp condition. If the problem being diagnosed is related to lamp accuracy,
be certain to confirm that the problem is with the lamp or switch and not with a damaged or inoperative transfer case or transfer case linkage. Refer to
Transmission and Drivetrain for more information. If no transfer case problem is found, the following procedure will help locate a short or open in the
indicator lamp circuit.
WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.
FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
Part Time
1. Check the fuse in the junction block. If OK, go to Step 2. If not OK, repair the shorted circuit or component as required and replace the faulty fuse.
2. Turn the ignition switch to the On position. Check for battery voltage at the fuse in the junction block. If OK, go to Step 3. If not OK, repair the
open circuit to the ignition switch as required.
3. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Unplug the transfer case switch wire harness
connector. Check for continuity between the ground circuit cavity of the transfer case switch wire harness connector and a good ground. There
should be continuity. If OK, go to Step 4. If not OK, repair the open circuit to ground as required.
4. Connect the battery negative cable. Turn the ignition switch to the On position. Install a jumper wire between the part time four wheel drive
indicator lamp driver circuit cavity of the transfer case switch wire harness connector and a good ground. The four-wheel drive indicator lamp
should light. If OK, replace the faulty transfer case switch. If not OK, go to Step 5.
5. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Remove the instrument cluster as described. With
the transfer case switch wire harness connector still unplugged, check for continuity between the part time four wheel drive indicator lamp driver
circuit cavity of the right instrument cluster wire harness connector (connector B) and a good ground. There should be no continuity If OK, go to
Step 6. If not OK, repair the short circuit as required.
6. Check for continuity between the part time four wheel drive indicator lamp driver circuit cavities of the right instrument cluster wire harness
connector (connector B) and the transfer case switch wire harness connector. There should be continuity. If OK, replace the faulty bulb. If not OK,
repair the open circuit as required.
Full Time
1. Check the fuse in the junction block. If OK, go to Step 2. If not OK, repair the shorted circuit or component as required and replace the faulty fuse.
2. Turn the ignition switch to the On position. Check for battery voltage at the fuse in the junction block. If OK, go to Step 3. If not OK, repair the
open circuit to the ignition switch as required.
3. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Unplug the transfer case switch wire harness
connector. Check for continuity between the ground circuit cavity of the transfer case switch wire harness connector and a good ground. There
should be continuity If OK, go to Step 4. If not OK, repair the open circuit to ground as required.
4. Connect the battery negative cable. Turn the ignition switch to the On position. Install a jumper wire between the full time four wheel drive
indicator lamp driver circuit cavity of the transfer case switch wire harness connector and a good ground. The four- wheel drive indicator lamp
should light. If OK, replace the faulty transfer case switch. If not OK, go to Step 5.
5. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Remove the instrument cluster as described. With
the transfer case switch wire harness connector still unplugged, check for continuity between the full time four wheel drive indicator lamp driver
circuit cavity of the right instrument cluster wire harness connector (connector B) and a good ground. There should be no continuity If OK, go to
Step 6. If not OK, repair the short circuit as required.
6. Check for continuity between the full time four wheel drive indicator lamp driver circuit cavities of the right instrument cluster wire harness
connector (connector B) and the transfer case switch wire harness connector. There should be continuity If OK, replace the faulty bulb. If not OK,
repair the open circuit as required.