Pinpoint Test W: The Reversing Lamps Are On Continuously

Reversing Lamps

Pinpoint Tests

Pinpoint Test W: The Reversing Lamps Are On Continuously

Refer to Wiring Diagram Set 93, Reversing Lamps for schematic and connector information. Diagrams By Number

Normal Operation

When the ignition switch is in the RUN position, voltage is provided to the digital Transmission Range (TR) sensor from the Central Junction Box (CJB). When the transmission is placed in REVERSE (R), the digital TR sensor routes voltage to the reversing lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Auto-dimming interior mirror
- Digital TR sensor

PINPOINT TEST W: THE REVERSING LAMPS ARE ON CONTINUOUSLY

WARNING: If the vehicle is equipped with a fire suppression system, repower the system. For important safety warnings and procedures, refer to Fire Suppression System. Failure to follow these instructions may result in serious personal injury Description and Operation.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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W1 CHECK THE DIGITAL TR SENSOR


- Ignition OFF.
- If equipped with a fire suppression system, depower the fire suppression system. Refer to Fire Suppression System Procedures.
- Disconnect: Digital TR Sensor C167.
- Connect: Negative Battery Cable.
- Ignition ON.
- Do the reversing lamps continue to illuminate?

Yes
If equipped with an auto-dimming interior mirror, GO to W2.

If not equipped with an auto-dimming interior mirror, REPAIR circuit 140 (BK/PK) for a short to voltage. TEST the system for normal operation. If equipped with a fire suppression system, REPOWER the fire suppression system. REFER to Fire Suppression System Procedures.

No
INSTALL a new digital TR sensor. REFER to Automatic Transaxle/Transmission - 4R70E/4R75E Service and Repair. TEST the system for normal operation. If equipped with a fire suppression system, REPOWER the fire suppression system. REFER to Fire Suppression System Procedures.

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W2 CHECK THE DIGITAL TR SENSOR OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: Auto-Dimming Interior Mirror C911.
- Ignition ON.
- Do the reversing lamps continue to illuminate?

Yes
REPAIR circuit 140 (BK/PK) for a short to voltage. TEST the system for normal operation. If equipped with a fire suppression system, REPOWER the fire suppression system. REFER to Fire Suppression System Procedures.

No
INSTALL a new auto-dimming interior mirror. REFER to Rear View Mirrors Interior Rear View Mirror. TEST the system for normal operation. If equipped with a fire suppression system, REPOWER the fire suppression system. REFER to Fire Suppression System Procedures.

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