Test W: The Reversing Lamps Are On Continuously

PINPOINT TEST W: THE REVERSING LAMPS ARE ON CONTINUOUSLY

Normal Operation
The reversing lamps relay coil ground is controlled by the PCM (automatic transmission, gasoline engine), the transmission control module (TCM) (automatic transmission, diesel engine), or the reversing lamp switch (manual transmission) through circuit CLS28 (BU/WH).

For vehicles with an automatic transmission, when the transmission is in REVERSE (R), the PCM or TCM provide ground for the reversing lamps relay to energize.

For vehicles with a manual transmission, when the transmission is in REVERSE (R), the reversing lamp switch completes the ground path through circuit GD122 (BK) to energize the reversing lamps relay.

When the reversing lamps relay is energized, voltage is routed through circuit CLS10 (GN/BN) to the reversing lamps, the electrochromatic mirror, the parking aid module (if equipped), and through the battery junction box (BJB) fuse 63 (15A) to circuit CAT03 (GY/BN) (trailer reversing lamps).

- DTC B1910 (Reverse Lamp Control Circuit/Open) - is an on-demand DTC that sets when the PCM (gasoline engine) or TCM (diesel engine) detects a short to ground on the reversing lamp relay coil ground control circuit.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Reversing lamps relay
- Reversing lamp switch (manual transmission)
- Rear view mirror
- Parking aid module (if equipped)
- TCM (automatic transmission, diesel engine)
- PCM (automatic transmission, gasoline engine)

W1-W5:

W6-W10: