Test K: The Stoplamps Are On Continuously

PINPOINT TEST K: THE STOPLAMPS ARE ON CONTINUOUSLY

K1:

K2-K7:

K7-K8:

Normal Operation
The stoplamp switch is supplied battery voltage through circuit 10 (LG/RD). When the brake pedal is applied, the stoplamp switch routes voltage to circuit 511 (LG). Circuit 511 (LG) supplies voltage to the multifunction switch and the high mounted stoplamp. The multifunction switch internally routes the power (when in the NEUTRAL position) to circuits 9 (LG/OG) (LH stoplamp) and 5 (OG/LB) (RH stoplamp). Circuits 9 (LG/OG) and 5 (OG/LB) are routed through the central junction box (CJB) and then to the LH and RH stoplamps, accordingly. Circuits 9 (LG/OG) (LH stoplamp) and 5 (OG/LB) (RH stoplamp) are spliced (and fused) within the CJB to circuits 52 (YE) and 64 (DG), respectively.

Possible Causes
- Circuit 5 (OG/LB) short to voltage
- Circuit 9 (LG/OG) short to voltage
- Circuit 52 (YE) short to voltage
- Circuit 64 (DG) short to voltage
- Circuit 511 (LG) short to voltage
- Stoplamp switch
- Multifunction switch
- Trailer brake control module
- Powertrain control module (PCM)