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Problem Symptoms Table

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
Entirely inoperative (Self check does not function).
  1. Power source circuit
  2. Clearance sonar ECU
  1. POWER SOURCE CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Entirely inoperative (Self check function normally).
  1. Power source circuit
  2. Combination meter system
  3. Clearance sonar ECU
  1. POWER SOURCE CIRCUIT 
  2. COMBINATION METER SYSTEM - DIAGNOSIS
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Front LH side sonar only does not function.
  1. Front left sensor circuit
  2. Front left side sensor circuit
  3. Front left center LH sensor circuit
  4. Clearance sonar ECU
  1. DTC B2232 FRONT LEFT SENSOR MALFUNCTION 
  2. CIRCUIT INSPECTION 
  3. DTC B2233 FRONT LEFT CENTER SENSOR MALFUNCTION 
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Front RH side sonar only does not function.
  1. Front right sensor circuit
  2. Front right side sensor circuit
  3. Front right center RH sensor circuit
  4. Clearance sonar ECU
  1. DTC B2235 FRONT RIGHT SENSOR MALFUNCTION 
  2. DTC B2236 FRONT RIGHT SIDE SENSOR MALFUNCTION 
  3. DTC B2234 FRONT RIGHT CENTER SENSOR MALFUNCTION 
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Rear LH sonar only does not function.
  1. Rear left sensor circuit
  2. Rear left center sensor circuit
  3. Clearance sonar ECU
  1. DTC B2237 REAR LEFT SENSOR MALFUNCTION 
  2. DTC B2238 REAR LEFT CENTER SENSOR MALFUNCTION 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Rear RH sonar only does not function.
  1. Rear right sensor circuit
  2. Rear right center sensor circuit
  3. Clearance sonar ECU
  1. DTC B2241 REAR RIGHT SENSOR MALFUNCTION 
  2. DTC B2239 REAR RIGHT CENTER SENSOR MALFUNCTION 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Although detection can be done, no buzzer sounds sometimes.
  1. Clearance sonar warning buzzer circuit
  2. Clearance sonar ECU
  1. CLEARANCE SONAR BUZZER CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Although detection can be done, the power indicator does not light sometimes.
  1. Clearance sonar warning buzzer circuit
  2. Combination meter system
  3. Clearance sonar ECU
  1. CLEARANCE SONAR BUZZER CIRCUIT 
  2. COMBINATION METER SYSTEM - DIAGNOSIS
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
The system operates with the shift lever not in R position, or does not operate with the shift lever in R position. (1)
  1. Neutral start switch circuit
  2. Clearance sonar ECU
  1. DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT)
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
The system operates with the shift lever in P position, or does not operate with the shift lever not in P position. (2)
  1. Neutral start switch circuit
  2. Clearance sonar ECU
  1. DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT)
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Detection can be done although the vehicle speed is 10km/h (6 mph) or less.
  1. Speed sensor circuit
  2. Clearance sonar ECU
  1. DTC P0500: VEHICLE SPEED SENSOR (VSS) "A" MALFUNCTION OR DTC P0503: VEHICLE SPEED SENSOR (VSS) "A" INTERMITTENT/ERRATIC/HIGH
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Buzzer volume is too low.
  1. Clearance sonar warning buzzer circuit
  2. Clearance sonar ECU
  1. CLEARANCE SONAR BUZZER CIRCUIT 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
No clearance sonar information displayed in multi-display.
  1. LEXUS navigation system
  2. Clearance sonar ECU
  1. LEXUS NAVIGATION SYSTEM - DIAGNOSIS
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
No clearance sonar information displayed in multi information display (Combination meter).
  1. Combination meter system
  2. Clearance sonar ECU
  1. COMBINATION METER SYSTEM - DIAGNOSIS
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
(1) Back sonar
(2) Clearance sonar
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