DTC B1570


id0902j0831700

DTC B1570

Headlight high beam status input circuit short to battery

DETECTION CONDITION

Short to power supply in wiring harness between PJB and light switch (high beam)

POSSIBLE CAUSE

• Short to power supply in wiring harness between PJB terminal J-04 L and light switch terminal K
• Light switch malfunction
• PJB malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT LIGHT SWITCH CONNECTOR
• Turn the ignition switch off.
• Disconnect the light switch connector.
• Inspect the light switch connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
2
INSPECT PJB CONNECTOR
• Disconnect the PJB connector.
• Inspect the PJB connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
3
INSPECT LIGHT SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between PJB terminal J-04 L (wiring harness-side) and body GND.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 5.
No
Go to the next step.
4
INSPECT LIGHT SWITCH
• Inspect the light switch.
• Is there any malfunction?
Yes
Replace the light switch, then go to the next step.
No
Go to the next step.
5
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PJB memory using the WDS or equivalent.
• Perform the self-test.
(See PJB SELF-TEST.)
• Is the same DTC present?
Yes
Replace the PJB.
No
DTC troubleshooting completed.