Pinpoint Test V: Both Reversing Lamps Are Inoperative
Reversing Lamps
Pinpoint Test V: Both Reversing Lamps Are Inoperative
Refer to Wiring Diagram Set 93, Reversing Lamps for schematic and connector information. Diagrams By Number
Normal Operation - 4R70E/4R75E Transmission
When the ignition switch is in the RUN position, voltage is supplied from the Battery Junction Box (BJB) fuse 54 (5A) to the digital Transmission Range (TR) sensor through circuit CBB54 (VT/OG). When the transmission is in REVERSE (R), the digital TR sensor routes voltage to the reversing lamps relay coil through circuit CET47 (BU). Ground for the reversing lamps relay coil is provided through circuit GD123 (BK/GY). Battery voltage is supplied from BJB fuse 43 (20A) to the reversing lamps relay switch side through circuit SBB43 (BU/RD). When the reversing lamps relay is energized, voltage is routed to the reversing lamps through circuit CAT16 (GY/BN). The reversing lamps share a common ground through circuit GD120 (BK/GN).
6R80 Transmission
The reversing lamps relay coil power is supplied by the Transmission Control Module (TCM) (also called the mechatronic assembly) through circuit CET47 (BU). The reversing lamps relay coil ground is controlled by the TCM through circuit CLS28 (BU/WH). When the transmission is in REVERSE (R), the TCM energizes the reversing lamps relay. Battery voltage is supplied from BJB fuse 43 (20A) to the reversing lamps relay switch side through circuit SBB43 (BU/RD). When the reversing lamps relay is energized, voltage is routed to the reversing lamps through circuit CAT16 (GY/BN). The reversing lamps share a common ground through circuit GD120 (BK/GN).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Digital TR sensor adjustment (4R70E/4R75E transmission)
- Reversing lamps relay
- Digital TR sensor (4R70E/4R75E transmission)
- TCM (6R80 transmission)
PINPOINT TEST V: BOTH REVERSING LAMPS ARE INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
V1-V3:
V3-V6:
V6-V9:
V9-V11:
V11-V12:
