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Home >> Lincoln >> 2003 >> LS V8-3.9L VIN A >> Repair and Diagnosis >> Lighting and Horns >> Backup Lamp >> Testing and Inspection >> Pinpoint Tests >> Test Z
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Test Z

PINPOINT TEST Z: THE INDIVIDUAL REVERSING LAMP IS INOPERATIVE


Test Z1-Z2:






Test Z3-Z4:






Normal Operation
When the powertrain control module (PCM) detects the transmission in REVERSE, a signal is sent to the rear electronic module (REM) to illuminate the reversing lamps. Power from the battery junction box (BJB) is sent through circuit 29S-LG1 (OG/YE) to circuits 29S-LG9 (OG/BK) and 29S-LG16 (OG/GN) to the LH and RH reversing lamps, respectively. Ground for the LH reversing lamp is sent through circuit 31S-LG9 (BK/GN) to the REM. Ground for the RH reversing lamp is sent through circuit 31S-LG16 (BK/RD) to the REM. The REM individually controls the ground circuits for the reversing lamps.

Possible Causes
- circuit 29S-LG9 (OG/BK) open
- circuit 29S-LG16 (OG/GN) open
- circuit 31S-LG9 (BK/GN) open or short to power
- circuit 31S-LG16 (BK/RD) open or short to power
- REM
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