B3187

Left Rear Window Down Switch Circuit Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$28–78 (est.)

Symptoms

Left rear window does not roll down
Intermittent operation of the window regulator
The glass may lower spontaneously

Causes

Window down switch malfunction
Open or shorted wiring harness
Poor contact in connectors
Body Control Module (BCM) Malfunction

How to Fix

Check the window down switch with a multimeter
Inspect the wiring harness for damage
Check the contacts in the switch and module connectors
Check the continuity of the circuit using a scanner or multimeter
3 pinpoint smart body control module check

Related codes

B3185 B3186 B3188