Troubleshooting Hints - Exterior Lights

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS:
1. If the Turn Lights or Backup Lights do not work, check I/P Fuse #6. If open, check for short to ground in CKT 239.
2. If the Stop Lights or Hazard Lights do not work, check I/P Fuse #37. If open, check for short to ground in CKT 140.
3. If one of the Turn Indicators goes on when the Park Lights are turned on, check the Front Park/Turn Lamp on that side for open or poor connection.
4. If Turn Lights stay on (do not flash) in both Turn Left and Turn Right, replace the Turn Flasher.
5. For any of the following symptoms, replace the Turn Signal Switch:
^ Turn Signal Switch will not turn "ON"/"OFF."
^ All Turn/Hazard/Stop Lights do not work and C210 is firmly mated.
^ Some Turn Lights work and all Hazard Lights work.
^ Some Hazard Lights work and all Turn Lights work.
^ Hazard Lights do not turn "OFF."
6. If Hazard Lights stay on (do not flash) in "Hazard," but Stop Lights operate normally, replace the Hazard Flasher.
7. If Stop Lights do not turn "OFF" adjust/replace the Stoplamp Switch.
8. If a Turn Indicator does not light but the Turn Signal works, check the bulb, connections and wiring to the Indicator. Refer to Instrument Cluster. Instrument Cluster / Carrier
9. If only one light does not operate, check the lamp, socket and related wiring for opens or corrosion (see schematic).
10. With [1][2]Twilight Sentinel, if Parking Lights stay on and Headlights stay at full intensity with daylight conditions check for an obstruction covering the Twilight Sentinel Photocell refer to Headlights With Twilight Sentinel. Headlamp
11. If one Front Park and/or Marker Lamp does not light, check that its ground is clean and tight.
12. If none of the Park/Taillamps work, check I/P Fuse #31. If open, check for short to ground in CKT 240.
13. If Park Lights do not turn "OFF," check Headlight Switch. If OK, repair short to B+ in CKT 9.
14. Sedan: If License Lamp is inoperative, check for open in CKT 750 between S408 and lamp socket. Check for open in CKT 1256 between S417 and lamp socket.
Wagon: If one License Lamp is inoperative, check for open in CKT 750 between S403 and inoperative lamp socket. Check for open in CKT 1256 between S409 and inoperative lamp socket.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems refer Diagnostic Aids. Diagnostic Aids
^ Refer to System Diagnosis. System Diagnosis - Exterior Lights