DTC B1537
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
B1537: Additional Heater Relay No.2 and No.3 Output Malfunction Output voltage of additional heater relay No.2 and/or No.3 is lower than specified value continuously. |
•Additional heater relay No.2 and/or No.3 output circuit
•Additional heater relay No.2 and/or No.3 •ECM |
Circuit Diagram
| [A]: | Connector “E01” (view [a]) | 3. | Additional heater relay No.3 | 6. | To main relay |
| 1. | Sub fuse box | 4. | Additional heater | 7. | To continuous power supply |
| 2. | Additional heater relay No.2 | 5. | ECM |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Additional Heater System Check” performed?
|
Go to Step 2.
|
|
| 2 |
Additional heater relay No.2 and No.3 check
1)Check additional heater relays No.2 and No.3.
Is each relay in good condition?
|
Go to Step 3.
|
Replace additional heater relay No.2 and/or No.3.
|
| 3 |
Wire harness check
1)Set ignition “OFF”.
2)Disconnect “E01” connector.
3)Measure resistance between “E01-18” terminal of ECM connector and ground.
4)Measure resistance between “E01-55” terminal of ECM connector and ground.
Is resistance infinity?
|
Replace ECM and recheck DTC.
|
Repair or replace main harness.
|