Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TEST REFERENCE - BACKUP LAMPS INOPERATIVE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Ignition on, engine not running. Place foot firmly on brake pedal. Place the shift lever in the reverse position. Do either of the Backup Lamps work? Yes --> Test Complete. No --> Go To 2 |
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| 2 | Turn the ignition off to the lock position. Install Transmission Simulator Miller tool #8333. Ignition on, engine not running. Press the Reverse Light Test button on the Transmission Simulator while observing the Backup Lamps. Do either of the Backup Lamps come on? Yes --> Go To 3 No --> Go To 4 |
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| 3 | If there are no possible causes remaining, view repair. Repair Replace Transmission Solenoid/TRS Assembly per the Service Information Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST . |
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| 4 | Remove both Backup Lamp bulbs. Measure the resistance of both Backup Lamp bulbs. Is the resistance above 5.0 ohms for either Backup Lamp bulbs? Yes --> Replace the Backup Lamp bulb or bulbs per the Service Information. Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST . No --> Go To 5 |
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| 5 | Remove the Backup Lamp bulb. Using a 12-volt test light connected to 12-volts, check the Backup Lamp ground circuit. Does the light illuminate brightly? Yes --> Go To 6 No --> Repair the Back up Lamp ground circuit for an open. Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST . |
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| 6 | Turn the ignition off to the lock position. Remove the Backup Lamp bulb. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Measure the resistance of the Backup Lamp Feed circuit from the Backup lamp Socket to the Solenoid/TRS harness connector. Is the resistance above 5.0 ohms? Yes --> Repair the Backup Lamp Supply circuit for an open. Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST . No --> Go To 7 |
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| 7 | Turn the ignition off to the lock position. Remove the Backup Lamp bulbs. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Measure the resistance between the Backup Lamp Feed circuit and ground. Is the resistance below 5.0 ohms? Yes --> Repair the Backup Lamp Feed circuit for a short to ground. Check the Fused Ignition Switch Output (RUN) fuse and replace if necessary. Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST . No --> Go To 8 |
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| 8 | Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, check the Fused Ignition Switch Output circuit.
NOTE:
The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes --> Test Complete. No --> Repair the Fused Ignition Switch Output circuit for an open. If the fuse is open make sure to check or a short to ground. Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST . |
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