Ambient Light Circuit [12/2013 - ]: Procedure

1. Confirm problem symptoms.

   Result

   Result	Proceed to
   Ambient lights do not come on	A
   Ambient light dimmer control does not operate	B

Result:  2

B 

See step  5

Result:  1

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the ambient lights come on.

   Body Electrical > Main Body > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Interior Illumination Light1	Ambient lights	ON or OFF	Precondition for using the Active Test to turn lights on and off: Ignition switch is turned off just before performing the Active Test.

   Body Electrical > Main Body > Active Test 

   Tester Display
   Interior Illumination Light1

   OK

   All ambient lights come on.

   Result

   Result	Proceed to
   OK	A
   NG (All ambient lights do not illuminate)	B
   NG (Ambient light does not illuminate (for Front Door))	C
   NG (Ambient light does not illuminate (for Rear Door))
   NG (Ambient light does not illuminate (for Instrument Panel Side))

Result:  1

A 

PROBLEM SYMPTOMS TABLE FOR EACH PROBLEM SYMPTOM. Refer to  PROBLEM SYMPTOMS TABLE [12/2013 - ]  

Result:  3

C 

GO TO PROBLEM SYMPTOMS TABLE FOR EACH PROBLEM SYMPTOM. Refer to  PROBLEM SYMPTOMS TABLE [12/2013 - ]  

Result:  2

B 

See step  3

1. Disconnect the 4L instrument panel junction block assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   4L-1 - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  4

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [12/2013 - ]

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

   Refer to REMOVAL [12/2013 - ]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4L-1 - 4H-22	Always	Below 1 Ω
   4L-1 - 4D-31	Always	Below 1 Ω
   4H-27 - MB-26 (LED1)	Always	Below 1 Ω
   4D-9 - MB-26 (LED1)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2013 - ] 

Result:  2

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the ambient lights come on.

   Body Electrical > Main Body > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Interior Illumination Light1	Ambient lights	ON or OFF	Preconditions for using the Active Test to check dimmer controlled illumination: Engine running Shift lever is in any position other than P.

   Body Electrical > Main Body > Active Test 

   Tester Display
   Interior Illumination Light1

   OK

   Ambient light dimmer control operates.

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2013 - ]  

Result:  2

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2013 - ]