OBD Guide
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B1789

Mirror Passenger Down Circuit Short To Ground

B1789 is an OBD-II diagnostic trouble code meaning: Mirror Passenger Down Circuit Short To Ground. Common causes: broken or short circuited wires in the harness, mirror motor malfunction. Estimated repair cost: $33–111.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–111 (est.)

Symptoms

  • Passenger mirror down adjustment does not work
  • The mirror doesn't move
  • Mirror stuck in one position

Causes

  • Broken or short circuited wires in the harness
  • Mirror motor malfunction
  • Problems with the mirror control module
  • Contact corrosion
  • Mechanical damage to wires

How to Fix

  1. Check the integrity of the wires.file in the door pillar and mirror
  2. Diagnose the operation of the mirror motor
  3. Check connections and contacts for corrosion
  4. Zamegol electrical parameters of the circuit using a multimeter
  5. If necessary, replace damaged wires or mirror assembly

Related codes

B1788B1787B1790

FAQ

What does the B1789 code mean?

B1789 is an OBD-II diagnostic trouble code that indicates: Mirror Passenger Down Circuit Short To Ground

What causes a B1789 error code?

The most common causes of B1789 include: Broken or short circuited wires in the harness; Mirror motor malfunction; Problems with the mirror control module; Contact corrosion.

How do I fix a B1789 diagnostic trouble code?

To fix B1789: Check the integrity of the wires.file in the door pillar and mirror. Diagnose the operation of the mirror motor. Check connections and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1789?

Do not drive — repair immediately

How much does it cost to fix B1789?

The estimated repair cost for B1789 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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