DTC Troubleshooting
DTC TROUBLESHOOTING CHART
| Step |
Action |
YES |
NO |
| 1 |
DTC check
- Connect scan tool to DLC with ignition switch turned OFF.
- Turn ignition switch ON and clear DTC referring to DTC CLEARANCE .
- Disconnect connector from information display with ignition switch turned OFF.
- Turn ignition switch ON and check DTC referring to DTC CHECK .
Is there DTC B1551? |
Go to Step 2. |
Information display faulty. |
| 2 |
Wire harness check
- Disconnect connectors from BCM and HVAC control module.
- Measure resistance between "G30-5" terminal of BCM connector and "G52-10" terminal of HVAC control module connector.
Is resistance below 5 Ω? |
Go to Step 3. |
"YEL/RED" wire open or high resistance circuit. |
| 3 |
Wire harness check
- Measure resistance between "G52-10" terminal of HVAC control module connector and vehicle body ground.
Is resistance infinity? |
Go to Step 4. |
"YEL/RED" wire shorted to ground circuit. |
| 4 |
Wire harness check
- Measure voltage between "G52-10" terminal of HVAC control module connector and vehicle body ground with ignition switch turned ON.
Is voltage 0 V? |
Go to Step 5. |
"YEL/RED" wire shorted to other circuit. |
| 5 |
Serial communication signal check
- Connect connectors to BCM and HVAC control module.
- Using oscilloscope, check that serial communication signal at "G30-5" is outputted referring to "VOLTAGE CHECK
" in INSPECTION OF BCM AND ITS CIRCUITS
.
Is serial communication signal outputted at "G30-5" terminal of BCM connector? |
HVAC control module faulty. |
BCM (included in junction block assembly) faulty. |