Test K
PINPOINT TEST K: THE STOPLAMPS ARE ON CONTINUOUSLYTest K1:
Test K2-K5:
Test K6-K8:
Normal Operation - Without IVD
The brake pedal position switch (BPP) is supplied battery voltage through circuit 10 (LG/RD). When the brake pedal is pressed, the BPP switch allows voltage to flow through circuit 511 (LG). Circuit 511 (LG) supplies power directly to the multifunction switch and to circuit 569 (DG) which supplies power to the high mounted stoplamp. The multifunction switch internally splits the power (when in the neutral position) to circuits 374 (DB/WH) (LH stoplamps) and 378 (BN/YE) (RH stoplamps). Circuits 374 (DB/WH) and 378 (BN/YE) supply power to the LH and RH stoplamps accordingly.
Normal Operation - With IVD
The brake pedal position switch (BPP) is supplied battery voltage through circuit 10 (LG/RD). When the brake pedal is pressed, the BPP switch allows voltage to flow through circuit 810 (RD/LG) which energizes the IVD stop lamp relay. With the relay energized, voltage is then supplied from circuit 10 (LG/RD) to circuit 511 (LG). Circuit 511 (LG) supplies power directly to the multifunction switch and to circuit 569 (DG) which supplies power to the high mounted stoplamp. The multifunction switch internally splits the power (when in the neutral position) to circuits 374 (DB/WH) (LH stoplamps) and 378 (BN/YE) (RH stoplamps). Circuits 374 (DB/WH) and 378 (BN/YE) supply power to the LH and RH stoplamps accordingly. The anti-lock brake system (ABS) module also has the capability to energize a second, separate relay which can control all the stoplamps. This occurs using the same circuitry but the ABS module energizes the relay coil via circuit 602 (RD/LG).
Possible Causes
- circuit 374 (DB/WH) short to power
- circuit 378 (BN/YE) short to power
- circuit 511 (LG) short to power
- circuit 569 (DG) short to power
- circuit 602 (RD/LG) short to ground
- circuit 810 (RD/LG) short to power
- circuit 1205 (BK) short to power
- BPP switch
- multifunction switch
- IVD stoplamp relay
- ABS module