Power Source Circuit [07/2020 -]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A65 No. 1 headlight ECU sub-assembly LH connector.
2. Disconnect the A66 No. 1 headlight ECU sub-assembly RH connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   & Routing (A65)

   (A65)

   NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH
   
   

   Tester Connection	Condition	Specified Condition
   A65-13 (ECUB) - Body ground	Power switch on (IG) or taillights on	11 to 14 V

   & Routing (A66)

   (A66)

   NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH
   
   

   Tester Connection	Condition	Specified Condition
   A66-13 (ECUB) - Body ground	Power switch on (IG) or taillights on	11 to 14 V

   Result

   Result	Proceed to
   OK	A
   NG (No. 1 Headlight ECU Sub-assembly LH)	B
   NG (No. 1 Headlight ECU Sub-assembly RH)	C

Result: 

B 

See step  4

Result: 

C 

See step  9

Result: 

A 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   & Routing (A65)

   (A65)

   NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH
   
   

   Tester Connection	Condition	Specified Condition
   A65-4 (IG) - Body ground	Power switch on (IG)	11 to 14 V

   & Routing (A66)

   (A66)

   NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH
   
   

   Tester Connection	Condition	Specified Condition
   A66-4 (IG) - Body ground	Power switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   & Routing (A65)

   (A65)

   NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH
   
   

   Tester Connection	Condition	Specified Condition
   A65-12 (GND) - Body ground	Always	Below 1 Ω

   & Routing (A66)

   (A66)

   NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH
   
   

   Tester Connection	Condition	Specified Condition
   A66-12 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2018 -] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the No. 1 integration relay.

   Refer to REMOVAL [07/2020 -]

2. Inspect the No. 1 integration relay.

   Refer to INSPECTION [11/2015 -]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [07/2020 -] 

Result: 

OK 

See step  5

1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   & Routing (A65)

   (A65)

   Tester Connection	Condition	Specified Condition
   1E-1 - A65-13 (ECUB)	Always	Below 1 Ω
   1E-1 or A65-13 (ECUB) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   1A-5 - Body ground	Power switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Disconnect the 3F instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1E-2 - 3F-31	Always	Below 1 Ω
   1E-2 or 3F-31 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

   Refer to REMOVAL [07/2020 -]

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3F-31 - MB-15 (HRLY)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [07/2020 -] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [07/2020 -] 

1. Remove the No. 1 integration relay.

   Refer to REMOVAL [07/2020 -]

2. Inspect the No. 1 integration relay.

   Refer to INSPECTION [11/2015 -]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [07/2020 -] 

Result: 

OK 

See step  10

1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   & Routing (A66)

   (A66)

   Tester Connection	Condition	Specified Condition
   1A-12 - A66-13 (ECUB)	Always	Below 1 Ω
   1A-12 or A66-13 (ECUB) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  11

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   1E-8 - Body ground	Power switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  12

1. Disconnect the F17 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   & Routing (F17)

   (F17)

   Tester Connection	Condition	Specified Condition
   1A-11 - F17-1 (DIM)	Always	Below 1 Ω
   1A-11 or F17-1 (DIM) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [07/2020 -] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR