Inspection Procedure

1. Delete the DTC (See DIAGNOSIS SYSTEM  ).
2. Check for DTCs again.

   OK: 

   DTC B2785, DTC B2287 and DTC B2781 are not output. 

   HINT:

   • If DTC B2785 is output (See DTC B2785 COMMUNICATION MALFUNCTION BETWEEN ECUS CONNECTED BY LIN; DTC B2786 NO RESPONSE FROM STEERING LOCK ECU; DTC B2789 NO RESPONSE FROM ID BOX ).
   • If DTC B2287 is output (See DTC B2287 LIN COMMUNICATION MASTER MALFUNCTION  ).
   • If DTC B2278 is output (See DTC B2278 ENGINE SWITCH CIRCUIT MALFUNCTION  ).

NG: GO TO DTC CHART 

OK: Go to next step. 

1. Check that the connectors are securely connected and the terminals are not deformed or loose.

   OK: 

   The connectors are securely connected and the terminals are not deformed or loose. 

NG: REPAIR OR REPLACE CONNECTORS 

OK: Go to next step. 

1. Disconnect the J55 ECU connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   J55-6 (GND2) - Body ground	Always	Below 1 Ω

Fig 1: Identifying J55 Power Source Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

1. Disconnect the J29 ECU connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   J55-26 (SLP) - J29-4 (SLP1)	Always	Below 1 Ω
   J55-32 (SLR+) - J29-3 (IGE)	Always	Below 1 Ω
   J55-30 (LIN1) - J29-5 (LIN)	Always	Below 1 Ω
   J29-2 (SGND) - Body ground	Always	Below 1 Ω
   J29-1 (GND) - Body ground	Always	Below 1 Ω
   J55-26 (SLP) or J29-4 (SLP1) - Body ground	Always	10 kΩ or higher
   J55-32 (SLR+) or J29-3 (IGE) - Body ground	Always	10 kΩ or higher
   J55-30 (LIN1) or J29-5 (LIN) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying J55 Power Source Control ECU And J29 Steering Lock ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

1. Reconnect the J55 ECU connector.
   Fig 3: Identifying J55 Power Source Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.
   DTC DETECTION CONDITION AND TROUBLE AREA
   
   

   Item	Contents
   Terminal (Symbols)	J55-26 (SLP) - Body ground
   Equipment Setting	2V/DIV., 100 ms./DIV.
   Condition	Engine switch on (IG)

   OK: 

   The waveform appears as shown in the illustration. 

   Fig 4: Waveform Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The waveform varies depending on the contents of communication.

NG: REPLACE POWER SOURCE CONTROL ECU 

OK: Go to next step. 

1. Reconnect the J29 ECU connector.
   Fig 5: Identifying Terminal SLP Of J55 Power Source Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.
   DTC DETECTION CONDITION AND TROUBLE AREA
   
   

   Item	Contents
   Terminal (Symbols)	J55-26 (SLP) - Body ground
   Equipment Setting	2V/DIV., 100 ms./DIV.
   Condition	Steering is LOCK / UNLOCK

   OK: 

   The waveform appears as shown in the illustration. 

   Fig 6: Waveform Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The waveform varies depending on the contents of communication.

NG: REPLACE STEERING LOCK ECU 

OK: Go to next step. 

1. Delete the DTCs (See DIAGNOSIS SYSTEM  ).
2. Check for DTCs again.

   OK: 

   DTC B2288 is not output. 

NG: REPLACE POWER SOURCE CONTROL ECU 

OK: REPLACE STEERING LOCK ECU