Chrysler Dodge Caravan 2002 Manual page 509

8L - 8 LAMPS/LIGHTING - EXTERIOR
FOG LAMP (Continued)
CONDITION
FOG LAMPS ARE DIM
WITH ENGINE
RUNNING ABOVE IDLE
FOG LAMPS FLASH
RANDOMLY
FOG LAMPS DO NOT
ILLUMINATE
POSSIBLE CAUSES
1. Charging system output too low.
2. Poor lighting circuit Z349/Z248
ground.
3. High resistance in fog lamp
circuit.
1. Poor lighting circuit Z349/Z248
ground.
2. Variable resistance in fog lamp
circuit.
3. Faulty fog lamp switch (part of
headlamp switch).
4. Loose or corroded terminals or
splices in circuit.
5. Is relay engaging properly?
6. PCI Bus Communication.
1. Blown fuse for fog lamp.
2. No Z349/Z248 ground at fog
lamps.
3. Faulty fog lamp switch (part of
headlamp switch).
4. Broken connector terminal or
wire splice in fog lamp circuit.
5. Faulty or burned out bulb.
6. Is relay engaging?
7. PCI Bus Communication.
CORRECTION
1. Test and repair charging system. Refer to
Electrical, Charging.
2. Test for voltage drop across Z349/Z248
ground locations. Refer to Electrical, Wiring
Information.
3. Test amperage draw of fog lamp circuit.
1. Test for voltage drop across Z349/Z248
ground locations. Refer to Electrical, Wiring
Information.
2. Test amperage draw of fog lamp circuit.
3. Replace headlamp switch.
4. Inspect and repair all connectors and splices.
Refer to Electrical, Wiring Information.
5. Verify function of fog lamp relay in IPM.
6. Verify PCI bus message (fog lamp info)
transmitted from BCM and received by FCM.
1. Replace fuse. Refer to Electrical, Wiring
Information.
2. Repair circuit ground. Refer to Electrical,
Wiring Information.
3. Replace headlamp switch.
4. Repair connector terminal or wire splice.
5. Replace bulb.
6. Verify function of fog lamp relay in IPM.
7. Verify PCI bus message (fog lamp info)
transmitted from BCM and received by FCM.
RS