Instrument Panel Illumination Circuit [08/2013 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the relay operates.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Interior Panel Relay	PANEL relay	ON/OFF	-

   OK

   PANEL relay operates.

NG → See step   2 

OK → See step   7 

1. Remove the PANEL relay from the H153 PANEL relay connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	Voltage is applied between terminals 1 and 2	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (PANEL Relay)

NG → REPLACE PANEL RELAY 

OK: Go to next step 

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H153-1 - Body ground	Always	11 to 14 V
   H153-3 - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the 3A 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
   H153-2 - 3A-38	Always	Below 1 Ω
   H153-2 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Install the PANEL relay.
2. Reconnect the 3A instrument panel junction block assembly connector.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   3A-38 - Body ground	Light control switch in off position	11 to 14 V
   	Light control switch in tail or head position	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Instrument Panel Junction Block Assembly)

NG → See step   6 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (PANEL RELAY - EACH INSTRUMENT PANEL ILLUMINATION) 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL [08/2013 - ] .
2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-38 - MB-22 (PANL)	Always	Below 1 Ω

NG → See step   9 

OK → See step   8