B2326

Code

Other B — Body

Mirror Driver Vertical Feedback Potentiometer Circuit Short to Battery

Brand: Other

Type: B — Body

Views: UK: 23 EN: 34 RU: 25

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Page language: EN

Causes

Short to battery (B+) on the vertical feedback/potentiometer wiring
Damaged or chafed wiring harness contacting a power source
Corroded or damaged mirror connector or terminals
Failed vertical position potentiometer inside mirror assembly
Failed mirror control module or internal driver circuitry
Poor or intermittent ground elsewhere causing false readings

Symptoms

Driver-side mirror will not adjust vertically or moves erratically
Mirror may be stuck in one position (often up or down)
Mirror memory/auto-position may fail for the driver mirror
Diagnostic trouble code B2326 stored in body control/mirror module
Possible clicking or motor noise without movement

What to check

Retrieve freeze-frame/scan tool data and confirm B2326 is current vs. historic
Visually inspect wiring along the door hinge, inside door, and mirror boot for damage
Inspect mirror connector for corrosion, bent pins, or signs of water ingress
Check related fuses and relays for mirror/memory circuits
Backprobe the mirror vertical feedback wire with a DMM to measure voltage with ignition and mirror operation
Measure resistance between the feedback wire and battery positive with the circuit disconnected to confirm a short

Signal parameters

Expected: feedback potentiometer wiper varies as mirror moves (typical control-range ≈ 0–5 V; designs vary).
When circuit is healthy, wiper voltage should change smoothly when mirror is moved.
Fault condition: voltage on feedback lead near battery voltage (≈ 12 V) or steady high level indicating a short to B+.
If referencing a 5 V reference design, seeing ≈ 5 V (or higher near battery voltage if direct short) with mirror stationary may indicate short or stuck wiper.
Use oscilloscope for noisy/erratic signals; DMM for steady high/low checks.

Diagnostic algorithm

Use a scan tool to verify B2326 and note related mirror or body codes. Confirm ignition ON and recreate fault if needed.
Visually inspect the mirror assembly, rubber boot, and door harness for pinched/chafed wiring or corrosion. Check mirror connector pins for damage.
With ignition ON, backprobe the vertical feedback wire at the mirror connector and measure DC voltage to ground while commanding mirror vertical movement. Note if voltage is high (near B+) and whether it changes.
With mirror unplugged (power off), measure resistance between the vertical feedback wire and battery positive. Low resistance indicates a short-to-battery.
If short confirmed in harness, isolate by disconnecting sections (mirror connector, door harness, body harness) and re-test to locate section with short. Check where harness passes over hinge where chafe is common.
If wiring checks good, test/replace the mirror assembly (potentiometer/motor). Reconnect and re-test feedback voltage and mirror operation.
If new mirror assembly still shows short at module side, suspect mirror control/body module. Verify module wiring and grounds; replace module only after isolating wiring/mirror as good.
Repair or replace damaged wiring/connector or replace mirror/module as required. Clear codes, perform mirror calibration/adaptations per manufacturer, and confirm repair by retesting mirror movement and rescanning for codes.

Likely causes

Pin pushed out or bent in mirror connector allowing contact with battery feed
Wiring harness chafe where it passes through door or hinge area contacting B+ conductor
Water intrusion corroding connector causing bridge to B+
Internal potentiometer failure shorting to the mirror's power input
Failed body/mirror control module output or input driver

Fault status

⚠️ Status

Mirror Driver Vertical Feedback Potentiometer Circuit Short to Battery detected. Check mirror harness, connector, and vertical feedback circuit for short to B+.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours