DTC B1541
Precautions: Precautions for Diagnosing Trouble · General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
B1541: Backup Power Supply Circuit Malfunction Backup power supply circuit voltage is low when ignition is “OFF”. |
•“DOME” fuse
•HVAC control module circuit •HVAC control module |
Circuit Diagram
| [A]: | HVAC control module connector (View: [a]) | 1. | J/B | 3. | HVAC control module |
| A1. | Power supply for backup circuit | 2. | “DOME” fuse | 4. | Power supply circuit |
DTC Confirmation Procedure
1)Set ignition “ON”.
2)Set ignition “OFF”.
3)Set ignition “ON”.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
DTC check
1)Set ignition “ON”.
2)Set ignition “OFF”.
3)Set ignition “ON” and check for DTC.
Is DTC B1541 still detected?
|
Go to Step 2.
|
Intermittent trouble.
|
| 2 |
Power supply for backup circuit check
1)Disconnect “G20” connector.
2)Measure voltage between “A1” circuit terminal of “G20” connector and ground.
Is voltage 10 – 14 V?
|
Replace HVAC control module and recheck DTC.
|
•Replace instrument panel harness.
•“DOME” fuse is blown. |