B1541

DTC B1541: Back-Up Power Supply Circuit Malfunction

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Troubleshooting

1. DTC Check

Turn ON ignition switch for 20 sec. or more.
Ignition switch turned OFF and connect scan tool to DLC.
Turn ON ignition switch and checked DTC.

Is there DTC B1541?
YES -
Go to Step 2.
NO -
Intermittent trouble.
Check for intermittent referring to Intermittent and Poor Connection Inspection Intermittent and Poor Connection Inspection.

2. Battery voltage supply circuit check

Disconnect connector from HVAC control module with ignition switch turned OFF.
Check for proper connection to HVAC control module connector at "G52-2" terminal.
If OK, measure voltage between "G52-2" terminal of HVAC control module connector and vehicle body ground.

Is voltage 10 - 14 V?
YES -
HVAC control module faulty.
NO -
Circuit fuse blown and/or "WHT" wire circuit open or short.