For 1990-2009 cars

Symptom | Procedure
--- | ---
The brake and center high mount stop lamp (CHMSL) is inoperative. | Chart 1
The center high mount stop lamp (CHMSL) is inoperative. The stop lamps are OK. | Remove the CHMSL connector. Probe the terminal circuit 20, LT BLU with a test lamp-to-ground. Apply the brakes. Does the bulb lamp? If no, open circuit 20 between the left IPFB and CHMSL connector. If yes, there is a faulty bulb or open circuit 650.
Only one brake lamp does not operate. | Check the bulb and related wiring for an affected stop lamp.
The turn lamps do not operate. The hazard lamps are OK. | Chart 2
The hazard lamps do not operate. The turn lamps are OK. | Chart 3
The left turn indicator is inoperative. | Check the bulb. If OK, open circuit 14 between the left IPFB.
The right turn indicator is inoperative. | Check the bulb. If OK, open circuit 15 between the left IPFB.
Park, marker, and tail lamps are inoperative. | The Tech 2 is connected. Turn the head lamp switch to the Park position and observe the park lamp input on the Tech 2. Is the input ON? If yes, open circuit 9 between the left IPFB and lamps. If no, disconnect the headlight connector. Connect a fused jumper between circuit 240, ORN and circuit 9, BRN. Does input on the Tech 2 change to ON? If yes, there are faulty connections or headlight switch. If no, open circuit 9 between the headlight switch and left IPFB.
Both license lamps are inoperative. | Open circuit 9 between the left IPFB and lamps.
Both back-up lamps are inoperative. | Chart 4
One back-up lamp is inoperative. | Check the related bulb and wiring.
Back-up lamps are always ON. | Check adjustment of the transaxle range switch (automatic) or back-up lamp switch (manual). If OK, circuit 240 is shorted to B+, or there is a faulty transaxle range switch (Auto) or back-up lamp switch (manual).
B2662 | Chart 5

### Brake Center High Mount Stop Lamp (CHMSL) Inoperative - Chart 1

### Turn Lamps Do Not Operate - Hazard Lamps OK - Chart 2

### Hazard Lamps Inoperative - Turn Lamps OK - Chart 3

### Left Hand And Right Hand Back-Up Lamps Are Inoperative - Chart 4