Test M: The Stoplamps Are Inoperative

PINPOINT TEST M: THE STOPLAMPS ARE INOPERATIVE

M1-M2:

M2-M4:

M5-M7:

M7-M9:

Normal Operation - Vehicles Without Stability Assist
The stoplamp ground circuits are independently controlled by the rear electronic module (REM). The stoplamp switch is supplied battery voltage through circuit 29-CF58 (OG/GN) from the central junction box (CJB). When the brake pedal is applied, the stoplamp switch allows voltage to flow through to circuit 29S-CF1 (OG/BU). Circuit 29S-CF1 (OG/BU) is spliced to carry the voltage to the powertrain control module (PCM) and the REM. Voltage to the REM (from the stoplamp switch) after the splice, is carried through circuit 29S-DK30 (OG). When the REM receives voltage from the stoplamp switch, the REM illuminates the stoplamps.

Normal Operation - Vehicles With Stability Assist
The stoplamp ground circuits are independently controlled by the REM. The stoplamp switch is supplied battery voltage through circuit 29-CF58 (OG/GN). When the brake pedal is applied, the stoplamp switch allows voltage to flow through circuit 29S-CF1 (OG/BU) to the anti-lock brake system (ABS) module. The ABS module then sends voltage through circuit 29S-CF2 (OG/BU), which is spliced to carry the voltage to the PCM and the REM. Voltage to the REM (from the ABS module) after the splice, is carried through circuit 29S-DK30 (OG). When the REM receives voltage from the ABS module, the REM illuminates the stoplamps.

Possible Causes
- Fuse
- Circuit 29-CF58 (OG/GN) open
- Circuit 29S-CF1 (OG/BU) open
- Circuit 29S-CF2 (OG/BU) open or short to ground
- Circuit 29S-DK30 (OG) open or short to ground
- Stoplamp switch
- REM
- ABS module