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Power Mirror Control System:

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS

Symptom Suspect Area See Section
Both right and left mirrors do not operate.
  1. Mirror switch circuit
  2. Passenger door ECU
  1. MIRROR POSITION SENSOR CIRCUIT (W/ MEMORY) 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Only one side of mirror does not operate.
  1. Mirror motor circuit
  2. Mirror position sensor circuit (w/ memory)
  3. Passenger door ECU
  1. MIRROR MOTOR CIRCUIT 
  2. MIRROR POSITION SENSOR CIRCUIT (W/ MEMORY) 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Retract mirror does not operate.
  1. Retract mirror switch
  2. Retract motor circuit
  3. Passenger door ECU
  1. MIRROR RETRACT SWITCH CIRCUIT
  2. RETRACT MOTOR CIRCUIT 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Driving position memory does not operate.
  1. Mirror position sensor circuit
  2. Passenger door ECU
  1. MIRROR POSITION SENSOR CIRCUIT (W/ MEMORY) 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
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