DTC C1554/23 Power Supply Relay Failure; DTC C1555/25 Motor Relay Welding Failure: Description
WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
If the power steering ECU detects these DTCs, it shuts off the motor relay circuit (built into the power steering ECU) and stops power assist.
DTC DETECTION CONDITION AND TROUBLE AREA
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| C1554/23 | Power source relay circuit malfunction | Power steering ECU |
| C1555/25 | Motor relay circuit malfunction | Power Steering ECU |