What Does B2190 Mean?
This code indicates the Body Control Module (BCM) has detected a short to battery voltage on the passenger rear window remote up switch circuit. The BCM monitors the switch input circuit and expects to see a ground or low voltage signal when the switch is pressed, but instead is seeing continuous battery voltage (typically 12-14V). This suggests current is flowing directly from the battery positive terminal to the switch circuit, bypassing normal control logic.
Common Causes
35%
Damaged or chafed wiring harness between BCM and rear door causing conductor to contact battery voltage
30%
Faulty passenger rear window switch assembly with internal short circuit
20%
Water intrusion or corrosion in door jamb connector causing cross-circuit short
10%
Failed Body Control Module with internal circuit failure on switch input
5%
Aftermarket accessory installation creating inadvertent voltage feed to switch circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of rear passenger door wiring harness from door jamb through door panel, looking for pinched, chafed, or damaged insulation that may contact metal surfaces or other power wires
2
Step 2: Disconnect the passenger rear window switch connector and measure voltage on the BCM side of the circuit with ignition on - should read 0V or near 0V; continuous battery voltage confirms wiring harness short upstream of switch
3
Step 3: If no voltage present at disconnected switch connector, use ohmmeter to test switch assembly for internal resistance between up switch terminal and battery voltage terminal - should read open circuit (OL); low resistance indicates failed switch
4
Step 4: Inspect door jamb boot and connector for water damage, corrosion, or pushed-out terminals that may be contacting adjacent circuits; clean and reseat connections if corroded
5
Step 5: If all wiring and switch test normal, perform BCM terminal voltage test on the specific switch input pin per service manual - abnormal voltage with all components disconnected indicates BCM internal fault
6
Step 6: Clear codes, reconnect all components, and operate window switch through full range while monitoring live data to confirm repair and verify normal voltage signals
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to battery voltage on the passenger rear window remote up switch circuit. The BCM monitors the switch input circuit and expects to see a ground or low voltage signal when the switch is pressed, but instead is seeing continuous ba...
The most common cause of B2190 (Window Passenger Rear Remote Up Switch Short to Battery) is: Damaged or chafed wiring harness between BCM and rear door causing conductor to contact battery voltage
Typical repair costs for B2190 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this does not affect vehicle operation or safety systems. The rear passenger window may not operate correctly or may operate unintentionally, which is an inconvenience but not a safety hazard requiring immediate repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2190 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System / Power Window System
Difficulty
Type
Generic (SAE)
Recommended Tools
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