Fog Lamp Diagnosis And Testing - Jeep Cherokee 2000 Service Manual

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