Back Door Courtesy Switch Circuit [11/2022 - ]: Procedure

1. Read the Data List according to the display on the Techstream.

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Back Door Courtesy Switch Status	Back door courtesy switch signal	Close or Open	Close: Back door closed Open: Back door open	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Back Door Courtesy Switch Status

   OK

   Normal conditions listed above are displayed.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

Refer to PROBLEM SYMPTOMS TABLE [11/2022 - 03/2023] , or refer to PROBLEM SYMPTOMS TABLE [03/2023 - 09/2024] , or refer to PROBLEM SYMPTOMS TABLE [09/2024 - ] 

Result: 

NG 

See step  2

1. Inspect the back door lock with courtesy light switch assembly.

   Refer to INSPECTION [06/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY 

Refer to REMOVAL [06/2018 - ]

Result: 

OK 

See step  3

1. Disconnect the 8H power distribution box assembly connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   V3-3 (D+) - 8H-5	Always	Below 1 Ω
   V3-3 (D+) or 8H-5 - Body ground	Always	10 kΩ or higher
   V3-2 (ACT-) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

   Refer to REMOVAL [11/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   8H-5 - MB-19 (BCTY)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

Refer to REMOVAL [11/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

Result: 

NG 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY 

Refer to REMOVAL [11/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]