Test T: The Reversing Lamps Are Inoperative

PINPOINT TEST T: THE REVERSING LAMPS ARE INOPERATIVE

T1-T2:

T2-T4:

T4-T7:

T7-T9:

T9-T11:

T11 Continued:

Normal Operation - Expedition
The digital transmission range (TR) sensor is supplied voltage from the central junction box (CJB) fuse 14 (10A) through circuit 295 (LB/PK). When the transmission is placed in REVERSE, the digital TR sensor routes voltage to the reversing lamps through circuit 140 (BK/PK).

Normal Operation - Navigator
The reversing lamps relay is supplied voltage from the CJB fuse 14 (10A) through circuit 295 (LB/PK). The reversing lamps relay coil power is supplied by the main control valve body through circuit 2270 (TN/RD). The reversing lamps relay coil ground is supplied by the main control valve body through circuit 2271 (DG/WH). When the reversing lamps relay is energized, the voltage is routed to the reversing lamps through circuit 140 (BK/PK). The reversing lamps share the ground through circuit 57 (BK).

Possible Causes
- Fuse
- Circuit 57 (BK) open
- Circuit 140 (BK/PK) open
- Circuit 295 (LB/PK) open
- Circuit 2270 (TN/RD) open or short to ground
- Circuit 2271 (DG/WH) open or short to voltage
- Reversing lamps relay
- Digital TR sensor
- CJB
- Main control valve body