DTC 78

DTC C15C7/78 DC Motor Power Source Voltage Malfunction

DTC C15C8/79 Power Supply Relay Failure

DESCRIPTION
The steering control ECU monitors PIG (motor power source voltage) and detects a malfunction in the power supply relay (located inside the steering control ECU).

If the steering control ECU detects a malfunction, it will turn on the master warning light, store these DTCs, and stop VGRS operation.

C15C7/78-C15C8/79:

WIRING DIAGRAM:

INSPECTION PROCEDURE

CAUTION:
The fault may be intermittent. Check harnesses and connectors thoroughly and retest.

Steps 1-3(Part 1):

Step 3(Part 2):