Inspection Procedure

1. Clear the DTCs (see DTC CHECK/CLEAR ).
2. Check for DTCs (see DTC CHECK/CLEAR ).

   Result 

   DTC OUTPUT RESULT
   
   

   Result	Proceed to
   DTC C1AEE is output	A
   No DTC is output	B

B: END 

A: Go to Next Step 

1. Reconnect the L90 ECU connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFIED CONDITIONS
   
   

   Tester Connection	Condition	Specified Condition
   L90-27 (CSG3) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value (s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFIED CONDITIONS
   
   

   Tester Connection	Condition	Specified Condition
   L90-8 (CSB3) - Body ground	Engine switch on (IG)	7.2 to 8.8 V

   Fig 1: Identifying L90 Parking Assist ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE PARKING ASSIST ECU  (See REMOVAL )

   OK: Go to Next Step 

1. Disconnect the L90 ECU connector.
2. Disconnect the D1 sensor connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFIED CONDITIONS
   
   

   Tester Connection	Condition	Specified Condition
   L90-8 (CSB3) - D1-1 (BI)	Always	Below 1 Ω
   L90-28 (LIN3) - D1-3 (SI)	Always	Below 1 Ω
   L90-27 (CSG3) - D1-5 (EI)	Always	Below 1 Ω
   L90-8 (CSB3) - Body ground	Always	10 kΩ or higher
   L90-28 (LIN3) - Body ground	Always	10 kΩ or higher
   L90-27 (CSG3) - Body ground	Always	10 kΩ or higher

   Fig 2: Identifying L90 Parking Assist ECU And D1 Front Left Side Sensor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

1. Disconnect the D1 and D5 sensor connectors.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFIED CONDITIONS
   
   

   Tester Connection	Condition	Specified Condition
   D1-2 (BO) - D5-1 (BI)	Always	Below 1 Ω
   D1-4 (SO) - D5-3 (SI)	Always	Below 1 Ω
   D1-6 (EO) - D5-5 (EI)	Always	Below 1 Ω
   D1-2 (BO) - Body ground	Always	10 kΩ or higher
   D1-4 (SO) - Body ground	Always	10 kΩ or higher
   D1-6 (EO) - Body ground	Always	10 kΩ or higher

   Fig 3: Identifying D1 Front Left Side And D5 Front Right Side Sensor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

1. Clear the DTCs (see DTC CHECK/CLEAR ).
2. Check for DTCs (see DTC CHECK/CLEAR ).

   Result 

   DTC OUTPUT RESULT
   
   

   Result	Proceed to
   DTC C1AEE is output	A
   No DTC is output	B

B: END 

A: Go to Next Step 

1. Replace the ultrasonic sensor (see REMOVAL ) with a normally functioning sensor.
   Fig 4: Identifying No. 2 Ultrasonic Sensor (Front Left Side Sensor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Clear the DTCs (see DTC CHECK/CLEAR ).
2. Check for DTCs (see DTC CHECK/CLEAR ).

   Result 

   DTC OUTPUT RESULT
   
   

   Result	Proceed to
   DTC C1AEE is output	A
   No DTC is output	B

B: END 

A: Go to Next Step 

1. Replace the ultrasonic sensor (see REMOVAL ) with a normally functioning sensor.

Fig 5: Identifying No. 2 Ultrasonic Sensor (Front Right Side Sensor)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Clear the DTCs (see DTC CHECK/CLEAR ).
2. Check for DTCs (see DTC CHECK/CLEAR ).

   Result 

   DTC OUTPUT RESULT
   
   

   Result	Proceed to
   DTC C1AEE is output	A
   DTC C1AEC is output	B
   No DTCs are output	C

B: GO TO DTC C1AEC  (See DTC C1AEC FRONT SENSOR COMMUNICATION MALFUNCTION )

C: END 

A: REPLACE PARKING ASSIST ECU  (See REMOVAL )