Code
B1432
FIAT
B — Body
Intermittent wiper relay short to ground
Views:
UK: 5
EN: 6
RU: 7
AI status
Completed
Completed
100%
Causes
- Damaged or pinched wiring harness to the wiper relay
- Corroded, loose, or damaged relay connector or terminals
- Faulty wiper relay (internal short)
- Aftermarket accessories or recent repairs that disturbed the circuit
- Intermittent short to ground in a splice, connector, or body harness
- Faulty Body Control Module (less common)
Symptoms
- Intermittent or inoperative windshield wipers
- Wipers working sporadically or stopping unexpectedly
- Blown wiper fuse(s)
- Erratic park position or failure to return to park
- DTC B1432 stored; possible BCM warning or message
What to check
- Read and record freeze-frame and pending codes with a scan tool
- Inspect relay, fuse(s), and relay socket for corrosion or damage
- Visually inspect wiring harness along route for chafing, pinches, or heat damage
- Wiggle test connector and harness while monitoring relay operation or live data
- Measure supply voltage and ground at relay socket with a multimeter
- Check continuity to ground from the relay control/feed pin(s) with relay removed
Signal parameters
- Relay coil control voltage: nominal battery voltage when commanded (approx. 12V) or 0V when not
- Ground continuity: near 0 ohms between relay ground pin and chassis ground
- Supply feed voltage to relay: battery voltage with ignition on
- Wiper motor current draw: within specification when relay engaged
- Scan tool status: BCM relay command state and any related inputs (wiper switch/washers)
Diagnostic algorithm
- Clear the code and operate wipers; confirm B1432 returns and note conditions when it sets.
- Visually inspect the relay, socket, fuse, and harness for damage or corrosion. Replace or clean as needed.
- With ignition on, backprobe the relay socket. Verify supply voltage, control voltage, and ground while commanding the relay via switch or scan tool.
- Perform a wiggle test on the connector and harness while monitoring the relay control signal and watch for the fault to reoccur.
- If an intermittent short to ground is suspected, disconnect the relay and measure resistance from the relay control pin to chassis ground. Compare with expected open/infinite when control not commanded.
- Isolate sections of harness: disconnect connectors one at a time to find which segment shows the short. Repair insulation, replace damaged sections, or repair corroded terminals.
- Swap with a known-good identical relay (if available) to rule out internal relay fault. Do not leave substitute relays in place if not identical.
- After repairs, clear codes and retest under the same conditions that originally produced the fault. Verify no recurrence and proper wiper operation.
- If wiring and relay check OK but code persists, inspect BCM connector and grounds. As a last resort, consult manufacturer tech info for BCM tests or reprogramming; avoid replacing the BCM without definitive evidence.
Likely causes
- Corroded or loose relay connector terminals
- Wiring insulation chafed and contacting chassis ground
- Faulty wiper relay with intermittent internal short
- Poor ground at relay or BCM connector
Fault status
Status
Intermittent wiper relay circuit short to ground detected
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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