DTC B1812[PJB]

id090208834700

DTC B1812

Backup light switch input circuit short to battery

DETECTION CONDITION

Short to power supply in wiring harness between PJB and back-up light switch

POSSIBLE CAUSE

•  Short to power supply in wiring harness between PJB terminal J-01 AE and back-up light switch terminal B (MTX)

•  Short to power supply in wiring harness between PJB terminal J-01 AE and TR switch terminal D (ATX)

•  Back-up light switch malfunction (MTX)

•  TR switch malfunction (ATX)

•  PJB malfunction

DTC B1812	Backup light switch input circuit short to battery
DETECTION CONDITION	Short to power supply in wiring harness between PJB and back-up light switch
POSSIBLE CAUSE	• Short to power supply in wiring harness between PJB terminal J-01 AE and back-up light switch terminal B (MTX) • Short to power supply in wiring harness between PJB terminal J-01 AE and TR switch terminal D (ATX) • Back-up light switch malfunction (MTX) • TR switch malfunction (ATX) • PJB malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT BACK-UP LIGHT SWITCH CONNECTOR • Turn the ignition switch off. • Disconnect the back-up light switch connector. (MTX) • Disconnect the TR switch connector. (ATX) • Inspect the 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.
1		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.
2		No	Go to the next step.
3	INSPECT BACK-UP 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-01 AE (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.
3		No	Go to the next step.
4	INSPECT BACK-UP LIGHT SWITCH • Inspect the back-up light switch. (MTX) (See BACK-UP LIGHT SWITCH INSPECTION.) • Inspect the TR switch. (ATX) (See TRANSAXLE RANGE (TR) SWITCH INSPECTION[FN4A-EL].) • Is there any malfunction?	Yes	Replace the back-up light switch (MTX) or TR switch (ATX), then go to the next step. (See TRANSAXLE RANGE (TR) SWITCH REMOVAL/INSTALLATION[FN4A-EL].)
4		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 M-MDS. • Perform the self-test. (See PJB SELF-TEST[PJB].) • Is the same DTC present?	Yes	Replace the PJB. (See PASSENGER JUNCTION BOX (PJB) REMOVAL/INSTALLATION.)
5		No	DTC troubleshooting completed.