Test I

PINPOINT TEST I: THE STOPLAMPS ARE INOPERATIVE

Test I1:

Test I1-I2:

Test I3-I5:

Test I6:

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 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 10 (LG/RD) open
- circuit 511 (LG) open
- circuit 810 (RD/LG) open
- circuit 1205 (BK) open
- BPP switch
- multifunction switch
- IVD stoplamp relay