B2110

Code

Other B — Body

Front Wiper Motor Relay Circuit Open (changed from Failure 2/6/97)

Brand: Other

Type: B — Body

Views: UK: 40 EN: 59 RU: 41

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Blown fuse for wiper circuit
Faulty front wiper relay (open coil)
Open or corroded connector at relay or wiper motor
Broken or shorted wiring in relay control or power feed
Faulty wiper motor (internal open)
Faulty body control module / wiper control module or poor ground

Symptoms

Front windshield wipers do not operate
No audible relay click when wiper is switched ON
Intermittent wiper operation or loss of function after motion
Possible other body electrical anomalies if the BCM is involved

What to check

Verify battery voltage is stable (12–14.5 V)
Inspect and test the wiper fuse(s) and replace if blown
Listen for relay click when activating wipers; replace relay with a known-good unit to test
Visually inspect relay socket, wiring harness and motor connector for corrosion, damage or disconnected pins
Scan for additional DTCs in body/wiper control module and check for communication errors

Signal parameters

Relay coil supply: battery voltage (approx. 12 V) present at relay feed terminal with key ON
Relay coil control: switched ground or 12 V command from control module when wiper is requested (should change with switch ON/OFF)
Relay coil resistance: should show continuity (typically tens to a few hundred ohms) — an open coil reads infinite ohms
Power to wiper motor: approx. battery voltage at motor power terminal when relay is engaged
Ground continuity: low resistance (

Diagnostic algorithm

Safety first: park wipers, turn ignition OFF, disconnect battery if required for repairs.
Inspect fuses: check and replace any blown wiper-related fuses.
Swap or bench-test relay: remove front wiper relay and test coil for continuity; substitute a known-good relay to see if wipers operate.
Probe relay socket with a multimeter: with ignition ON and wiper switch OFF verify battery feed at relay feed terminal; with switch ON verify control terminal toggles (0 V to ~12 V or ground switching) as expected.
Check continuity: verify continuity between relay output terminal and wiper motor power terminal, and between motor ground and chassis ground.
Inspect connectors and wiring: look for corrosion, bent pins, water intrusion, or broken wires; perform wiggle test while operating wipers (if safe) to reproduce intermittent faults.
Test wiper motor: if relay and wiring are good but motor does not run when power is applied, bench-test/apply direct 12 V to motor to confirm motor assembly condition.
If wiring and motor are good, scan and test the body/wiper control module for internal faults; verify power/ground/communication lines to module.
Repair or replace failed components (fuse, relay, wiring, connector, motor, or control module) as identified; clear codes and retest system operation to confirm repair.

Likely causes

Blown fuse or failed relay (most common)
Open/disconnected connector or corroded terminal at relay socket
Broken wire in harness between BCM and relay or between relay and wiper motor
Failed wiper motor with open internal winding
Faulty control module or poor ground (least common)

Fault status

⚠️ Status

Stored when the front wiper motor relay control circuit is detected open (no relay coil continuity or lost control signal). This may result in no front wiper operation.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours