B1540

DTC B1540

DTC Detecting Condition and Trouble Area






Circuit Diagram










DTC Confirmation Procedure

1) Start engine and operate A/C system.

DTC Troubleshooting


1. DTC check
Push engine switch to change ignition mode to "ON".
Push engine switch to change ignition mode to "OFF".
Push engine switch to change ignition mode to "ON" and check DTC.
Is DTC B1540 still detected?
YES
Go to Step 2.
NO
Intermittent trouble.
2. Battery voltage supply circuit check
Disconnect auto A/C panel connector.
Measure voltage between "WHT" wire terminal of auto A/C panel connector and ground.
Is voltage 10 - 14 V?
YES
Replace auto A/C panel. HVAC Control Module Removal and Installation
NO
Repair or replace defective wire harness.
"DOME" fuse blown.