Test G: DTC C1862 - Contactor Circuit Failure

PINPOINT TEST G: DTC C1862 - CONTACTOR CIRCUIT FAILURE

Normal Operation

With the engine running, the battery power off (BPO) function may be triggered by the front and/or rear inertia fuel shut off (IFS) switches opening, a high-voltage interlock circuit opening, the electrical interlock (EL I) circuit opening (fuse protected by the battery junction box [BJB] fuse 26 [5A]) or if the contactor box within the traction battery control module (BCM) requests a BPO mode. If the IFS switch opens and causes the BPO mode to occur, no DTCs are set. Also, if the IFS switch is open, a power reset indicator in the instrument cluster illuminates.
- DTC C1862 Contactor Circuit Failure - The PCM monitors the frequency signal the BCM sends out on the BPO circuit CDC05 (GY/VT). If the TBCM detects a fault condition, it changes the frequency signal over the BPO circuit CDC05 (GY/VT) and also sends an error message to the PCM over the communication link. With the ignition switch in the ON position and the engine ON or OFF (the engine must have run at least once after the key was cycled to ON), the BCM monitors the contactors continuously. During a power down (key OFF) sequence, one or both of the contactors may cause the TBCM to set this DTC if they fail.

This pinpoint test is intended to diagnose the following:

- High-voltage traction battery (HVTB)
- Service disconnect plug

G1:

G2 - G3: