Jeep Cherokee 2000 Service Manual - page 454
CONDITION
POSSIBLE CAUSES
CORRECTION
HEADLAMPS FLASH
RANDOMLY
1. Poor lighting circuit Z1-ground.
1. Test for voltage drop across Z1-ground
locations, refer to Group 8W.
2. High resistance in headlamp
circuit.
2. Test amperage draw of headlamp circuit.
Should not exceed 30 amps.
3. Faulty headlamp switch.
3. Replace headlamp switch. Refer to
Group 8E.
4. Loose or corroded terminals or
splices in circuit.
4. Inspect and repair all connectors and
splices, refer to Group 8W.
HEADLAMPS DO NOT
ILLUMINATE
1. No voltage to headlamps.
1. Repair open headlamp circuit, refer to
Group 8W.
2. No Z1-ground at headlamps.
2. Repair circuit ground, refer to Group 8W.
3. Faulty headlamp switch.
3. Replace headlamp switch. Refer to
Group 8E.
4. Faulty headlamp dimmer
(multi-function) switch.
4. Replace multi-function switch.
5. Broken connector terminal or wire
splice in headlamp circuit.
5. Repair connector terminal or wire splice.
*Canada vehicles must have lamps ON.
FOG LAMP
CONDITION
POSSIBLE CAUSES
CORRECTION
FOG LAMPS ARE DIM
WITH ENGINE IDLING OR
IGNITION TURNED OFF.
1. Loose or corroded battery cables.
1. Clean and secure battery cable clamps
and posts.
2. Loose or worn generator drive
belt.
2. Adjust or replace generator drive belt.
3. Charging system output too low.
3. Test and repair charging system. Refer to
Group 8A,
4. Battery has insufficient charge.
4. Test battery state-of -charge. Refer to
Group 8A.
5. Battery is sulfated or shorted.
5. Load test battery. Refer to Group 8A.
6. Poor lighting circuit Z1-ground.
6. Test for voltage drop across Z1-ground
locations. Refer to Group 8W.
FOG LAMP BULBS BURN
OUT FREQUENTLY
1. Charging system output too high.
1. Test and repair charging system. Refer to
Group 8A.
2. Loose or corroded terminals or
splices in circuit.
2. Inspect and repair all connectors and
splices. Refer to Group 8W.
FOG LAMPS ARE DIM
WITH ENGINE RUNNING
ABOVE IDLE
1. Charging system output too low.
1. Test and repair charging system. Refer to
Group 8A.
2. Poor lighting circuit Z1-ground.
2. Test for voltage drop across Z1-ground
locations. Refer to Group 8W.
3. High resistance in fog lamp circuit.
3. Test amperage draw of fog lamp circuit.
8L - 4
LAMPS
XJ
DIAGNOSIS AND TESTING (Continued)