Pinpoint Test W: An Individual Reversing Lamp Is Inoperative

Reversing Lamps

Pinpoint Tests

Pinpoint Test W: An Individual Reversing Lamp Is Inoperative

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

When the reversing lamps relay is energized, voltage is routed to the reversing lamps through circuit CLS10 (GN/BN). The LH and RH reversing lamps share the ground circuits with the stoplamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Rear lamp jumper harness



PINPOINT TEST W: AN INDIVIDUAL REVERSING LAMP IS INOPERATIVE

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 FOR VOLTAGE TO THE REVERSING LAMP


- Apply the parking brake.
- Select REVERSE.
- Ignition ON.
- For Taurus or Sable, measure the voltage between the LH rear lamp C414-1, circuit CLS10 (GN/BN), harness side and ground, or between the RH rear lamp C417-1, circuit CLS10 (GN/BN), harness side and ground.




- For Taurus X, measure the voltage between the LH rear lamp C498-1, circuit CLS10 (GN/BN), harness side and ground, or between the RH rear lamp C499-1, circuit CLS10 (GN/BN), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
REPAIR or INSTALL a new rear lamp jumper harness. TEST the system for normal operation.

No
REPAIR circuit CLS10 (GN/BN) for an open. TEST the system for normal operation.

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