What Does B2194 Mean?
This code indicates the Body Control Module (BCM) has detected an abnormal voltage condition on the passenger rear window down switch circuit. The switch circuit is continuously reading battery voltage (typically 12-14V) when it should be at a lower reference voltage or ground, indicating a short to power condition. This prevents normal operation of the passenger rear window remote down function.
Common Causes
35%
Damaged or pinched wiring harness causing short to power between switch and BCM
30%
Faulty master window switch assembly with internal short circuit
20%
Water intrusion or corrosion in switch connector causing cross-circuit short
10%
Failed BCM with internal circuit fault or damaged input pins
5%
Aftermarket accessory installation causing improper power feed to circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of master window switch assembly and all door wiring harnesses, particularly at hinge areas and door jambs. Look for damaged insulation, pinched wires, water intrusion, or corrosion in connectors.
2
Step 2: Disconnect the master window switch assembly connector. Using a digital multimeter, measure voltage at the BCM side of the passenger rear down switch circuit terminal. Reading should drop to 0-0.5V with switch disconnected; sustained battery voltage confirms short is in wiring harness.
3
Step 3: If voltage drops with switch disconnected, reconnect and measure resistance across the down switch terminals while actuating the switch. Should read open circuit (OL) at rest and low resistance (typically 0-5 ohms) when pressed. Continuous low resistance or battery voltage indicates failed switch assembly.
4
Step 4: If harness shows short with switch disconnected, inspect door harness boot at hinge area by flexing wires while monitoring voltage. Trace wiring from door to BCM, checking for pinch points, improper routing, or damaged insulation at body mounting points.
5
Step 5: Check BCM connector terminals for bent pins, corrosion, or pushed-back terminals causing cross-circuit contact. If all wiring and switch test good, suspect BCM internal fault.
6
Step 6: After repair, clear codes and cycle window switches through all positions multiple times to verify proper operation and confirm code does not return.
Estimated Repair Cost
$75 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an abnormal voltage condition on the passenger rear window down switch circuit. The switch circuit is continuously reading battery voltage (typically 12-14V) when it should be at a lower reference voltage or ground, indicating a short to...
The most common cause of B2194 (Window Passenger Rear Remote Down Switch Short to Battery) is: Damaged or pinched wiring harness causing short to power between switch and BCM
Typical repair costs for B2194 range from $75 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive, as this only affects the convenience feature of remotely lowering the rear passenger window. No immediate safety concerns exist, though repair should be completed to restore full window function and prevent potential BCM damage from sustained short circuit condition.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2194 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Accessories
Difficulty
Type
Generic (SAE)
Recommended Tools
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