Pinpoint Test AC: An Individual Reversing Lamp Is Inoperative

Reversing Lamps

Pinpoint Test AC: An Individual Reversing Lamp Is Inoperative

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

Normal Operation

The PCM monitors the transmission. When the transmission is in reverse, the PCM sends a message to the Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN) indicating the transmission is in reverse. When the BCM (Body Control Module) receives the message indicating the transmission is in reverse, the BCM (Body Control Module) provides voltage to the reversing lamps.

The reverse lamps share the ground circuit with the stoplamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

PINPOINT TEST AC : 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.

NOTE: Make sure the stoplamps operate before diagnosing the reversing lamps.

AC1 CHECK FOR VOLTAGE TO THE REVERSING LAMP

- Ignition OFF.

- Apply the parking brake.

- Disconnect: Inoperative Reversing Lamp.

- Ignition ON.

- Select REVERSE.

- For Edge, measure the voltage between the LH reversing lamp C414-5, circuit CLS28 (BU/WH), harness side and ground; or between the RH reversing lamp C417-5, circuit CLS28 (BU/WH), harness side and ground.






- For MKX, measure the voltage between the LH reversing lamp C414-4, circuit CLS28 (BU/WH), harness side and ground; or between the RH reversing lamp C417-4, circuit CLS28 (BU/WH), 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 CLS28 (BU/WH) for an open. TEST the system for normal operation.