J: C1287 - Brake Booster Pedal Force Switch Circuit Failure

Pinpoint Test J: DTC C1287 Brake Booster Pedal Force Switch Circuit Failure

Normal Operation
The active brake booster has a normally open and a normally closed pedal force switch that operates according to driver brake applications.

The normally open pedal force switch circuit is 1581 (PK/LB). The normally closed pedal force switch circuit is 1580 (WH/LG).

Possible Causes
^ circuit 1579 (OG/RD) open, short to ground
^ circuit 1580 (WH/LG) open, short to voltage, or short to ground
^ circuit 1581 (PK/LB) open, short to voltage, or short to ground
^ active brake booster
^ ABS module

Tests J1 - J3:

Tests J4 - J5:

Tests J6 - J7:

Test J8:

PINPOINT TEST J: DTC C1287 BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT FAILURE

CAUTION: Use the flex probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.