S: C2777 and C2778 - Sensor Cluster Bus Failure

Pinpoint Test S: DTC C2777 and DTC C2778 - Sensor Cluster Bus Failure
Normal Operation
The yaw rate sensor and accelerometer are part of the sensor cluster which sends various signals about the vehicles dynamics through a 2 wire bus controller area network (CAN) 4-CF66 (GY/VT) and CAN 5-CF66 (BU/WH). The CAN bus receives a twelve volt input through circuit 7-CF67 (YE/RD) in series with the steering wheel rotation sensor circuitry. Ground is provided through circuit 9-CF67 (BN/RD).

Possible Causes
^ power circuit 7-CF67 (YE/RD) open, short to ground, or short to power
^ ground circuit 9-CF67 (BN/RD) open, short to ground, or short to power
^ steering wheel rotation sensor
^ circuit 4-CF66 (GY/VT)
^ circuit 5-CF66 (BU/WH)
^ sensor cluster
^ Anti Lock Brake System (ABS) module

Test S1-S2:

Test S3-S5:

Test S6-S7:

Test S8:

PINPOINT TEST S: DTC C2777 AND DTC C2778 SENSOR CLUSTER BUS FAILURE

NOTE: Measure all pins of the sensor cluster and ABS module when removing connectors. Care should be taken when reinstalling these connectors.