DESCRIPTION
The main body ECU (multiplex network body ECU) detects the condition of the door
courtesy light switch assembly.
WIRING DIAGRAM
PROCEDURE
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1.
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READ VALUE USING TECHSTREAM
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(a) Using the Techstream, read the Data List.
Click here 
Main Body
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Tester Display
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Measurement Item / Range
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Normal Condition
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Diagnostic Note
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FR Door Courtesy SW
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Front door courtesy light switch assembly RH signal / OFF or ON
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OFF: Front door RH closed
ON: Front door RH open
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-
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FL Door Courtesy SW
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Front door courtesy light switch assembly LH signal / OFF or ON
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OFF: Front door LH closed
ON: Front door LH open
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-
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RR Door Courtesy SW
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Rear door courtesy light switch assembly RH signal / OFF or ON
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OFF: Rear door RH closed
ON: Rear door RH open
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-
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RL Door Courtesy SW
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Rear door courtesy light switch assembly LH signal / OFF or ON
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OFF: Rear door LH closed
ON: Rear door LH open
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-
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OK:
Normal condition listed above are displayed.
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Result
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Proceed to
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OK
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A
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NG ("FR Door Courtesy SW" is abnormal)
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B
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NG ("FL Door Courtesy SW" is abnormal)
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C
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NG ("RR Door Courtesy SW" is abnormal)
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D
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NG ("RL Door Courtesy SW" is abnormal)
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E
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| A |
 |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
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| C |
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GO TO STEP 4
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| D |
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GO TO STEP 6
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| E |
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GO TO STEP 9
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| B |
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2.
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INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH
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(a) Remove the front door courtesy light switch assembly RH.
Click here
(b) Inspect the front door courtesy light switch assembly RH.
Click here
| NG |
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REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH
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| OK |
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|
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3.
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CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU]
- FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH)
|
(a) Disconnect the J165 main body ECU (multiplex network body ECU) connector.
(b) Disconnect the Q5 front door courtesy light switch assembly RH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
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Condition
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Specified Condition
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J165-27 (FRCY) - Q5-1
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Always
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Below 1 Ω
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J165-27 (FRCY) or Q5-1 - Body ground
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Always
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10 kΩ or higher
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| OK |
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REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
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| NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|
4.
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INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH
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(a) Remove the front door courtesy light switch assembly LH.
Click here
(b) Inspect the front door courtesy light switch assembly LH.
Click here
| NG |
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REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH
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| OK |
|
|
|
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5.
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CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU]
- FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH)
|
(a) Disconnect the J165 main body ECU (multiplex network body ECU) connector.
(b) Disconnect the P5 front door courtesy light switch assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
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Condition
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Specified Condition
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|
J165-6 (FLCY) - P5-1
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Always
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Below 1 Ω
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J165-6 (FLCY) or P5-1 - Body ground
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Always
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10 kΩ or higher
|
| OK |
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REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
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| NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|
6.
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INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY RH
|
(a) Remove the rear door courtesy light switch assembly RH.
Click here
(b) Inspect the rear door courtesy light switch assembly RH.
Click here
| NG |
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REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY RH
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| OK |
|
|
|
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7.
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CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - REAR
DOOR COURTESY LIGHT SWITCH ASSEMBLY RH)
|
(a) Disconnect the 3J driver side junction block assembly connector.
(b) Disconnect the Q6 rear door courtesy light switch assembly RH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
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Specified Condition
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|
3J-31 - Q6-1
|
Always
|
Below 1 Ω
|
|
3J-31 or Q6-1 - Body ground
|
Always
|
10 kΩ or higher
|
| NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| OK |
|
|
|
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8.
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CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY
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(a) Remove the driver side junction block assembly.
Click here
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|
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*a
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Component without harness connected
(Driver Side Junction Block Assembly)
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|
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(b) Remove the main body ECU (multiplex network body ECU) from the driver side
junction block assembly.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
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Specified Condition
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|
3J-31 - A-2 (RCTY)
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Always
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Below 1 Ω
|
| OK |
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REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
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REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY
|
|
9.
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INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY LH
|
(a) Remove the rear door courtesy light switch assembly LH.
Click here
(b) Inspect the rear door courtesy light switch assembly LH.
Click here
| NG |
|
REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY LH
|
| OK |
|
|
|
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10.
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CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - REAR
DOOR COURTESY LIGHT SWITCH ASSEMBLY LH)
|
(a) Disconnect the 3K driver side junction block assembly connector.
(b) Disconnect the P6 rear door courtesy light switch assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
3K-24 - P6-1
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Always
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Below 1 Ω
|
|
3K-24 or P6-1 - Body ground
|
Always
|
10 kΩ or higher
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| OK |
|
|
|
|
11.
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CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY
|
|
(a) Remove the driver side junction block assembly.
Click here
|
|
|
*a
|
Component without harness connected
(Driver Side Junction Block Assembly)
|
|
|
(b) Remove the main body ECU (multiplex network body ECU) from the driver side
junction block assembly.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
3K-24 - A-13 (LCTY)
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Always
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Below 1 Ω
|
| OK |
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REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
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REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY
|
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