Inspection Procedure
WARNING: This page is about a different car, the 2008 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT DISTANCE CONTROL ECU (IGB VOLTAGE)
- Disconnect the A26 laser radar sensor connector.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
VOLTAGE SPECIFICATIONTester Connection Switch Condition Specified Condition A26-5 (IGB) - Body ground Ignition switch ON 11 to 14 V - Reconnect the laser radar sensor connector.
NG: Go to step 3
OK: Go to Next Step
- CHECK HARNESS AND CONNECTOR (LASER RADAR SENSOR - ECM AND BODY GROUND)
- Disconnect the A27 connector from the ECM.
- Disconnect the A26 connector from the laser radar sensor.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
RESISTANCE REFERENCETester Connection Condition Specified Condition A27-44 (LGND) - A26-1 (LGND) Always Below 1 Ω A26-1 (LGND) - Body ground Always 10 kΩ or higher A26-2 (SGND) - Body ground Always Below 1 Ω - Reconnect the ECM and laser radar sensor connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
- CHECK HARNESS AND CONNECTOR (LASER RADAR SENSOR - DISTANCE CONTROL ECU)
- Disconnect the A43 distance control ECU connector.
- Disconnect the A26 laser radar sensor connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
RESISTANCE REFERENCETester Connection Condition Specified Condition A26-5(IGB) - A43-13 (IGB) Always Below 1 Ω A43-13 (IGB) - Body ground Always 10 kΩ or higher - Reconnect the ECU and laser radar sensor connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig 3: Identifying A26 Laser Radar Sensor Connector Terminal And A43 Distance Control ECU Connector TerminalCourtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE DISTANCE CONTROL ECU (See REMOVAL )