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

Test J1:

Test J2-J4:

Test J4-J6:

Test J6:

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

Normal Operation
The active brake booster has a Normally Open (NO), and a Normally Closed, (NC) pedal force switch that operates according to driver brake applications.
The NO pedal force switch circuit is 1581 (PK/LB). The NC pedal force switch circuit is 1580 (WH/LG).

Possible Causes
^ NO pedal force switch circuit 1581 (PK/LB).
^ NC pedal force switch circuit 1580 (WH/LG).
^ Active brake booster.
^ ABS module.