What Does B1432 Mean?
This code indicates the Body Control Module (BCM) has detected that the wiper brake/run relay control circuit is experiencing a short to battery voltage. The relay, which controls the park position and run operation of the windshield wipers, is receiving unintended power when it should be off or at a lower voltage. This fault prevents proper control of the wiper motor parking function and may cause wipers to operate erratically or not park correctly.
Common Causes
40%
Damaged or chafed wiring harness between BCM and wiper relay causing short to power
30%
Faulty wiper brake/run relay with internal short circuit
20%
Water intrusion or corrosion in relay socket or connector causing cross-circuit short
10%
Failed Body Control Module with shorted output driver circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of wiper relay, relay socket, and associated wiring harness for signs of damage, corrosion, melting, or chafing. Check for water intrusion in relay box and connectors.
2
Step 2: Remove the wiper brake/run relay and use a multimeter to measure voltage at the relay control terminal in the socket with ignition on. Should read 0V or system voltage only when BCM commands relay on. If constant battery voltage present, trace wiring for short to power.
3
Step 3: Test the removed relay for internal short by measuring resistance between control coil terminals and power terminals. Should read open circuit (infinite resistance) between these circuits. Replace relay if shorted internally.
4
Step 4: If wiring and relay test good, disconnect BCM connector and measure resistance from relay control wire to ground and to battery voltage. Should read infinite resistance. If low resistance found, repair short in harness between BCM and relay.
5
Step 5: If all wiring and relay test normal, suspect BCM internal fault. Verify BCM operation by substituting known-good relay and monitoring command signals with advanced scan tool bidirectional controls.
6
Step 6: Clear codes, reinstall all components, and perform wiper system functional test through all modes (intermittent, low, high, wash). Verify proper park position and confirm no code returns.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected that the wiper brake/run relay control circuit is experiencing a short to battery voltage. The relay, which controls the park position and run operation of the windshield wipers, is receiving unintended power when it should be off or at ...
The most common cause of B1432 (Wiper Brake/Run Relay Circuit Short To Battery) is: Damaged or chafed wiring harness between BCM and wiper relay causing short to power
Typical repair costs for B1432 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive in clear weather conditions. Wipers may not function properly or park correctly, which creates a safety hazard in rain or snow. Repair should be completed before adverse weather conditions are encountered.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1432 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Body
System
Windshield Wiper System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
