Dimmer Signal Circuit [04/2013 - 10/2016]: Procedure

1. Disconnect the K72 radio receiver assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K72-3 (ADIM) - Body ground	Engine switch on (IG) Automatic light control sensor covered by hand, and light control switch in tail or head position	9 V or higher

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Radio Receiver Assembly)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [04/2013 - 06/2014]  , or refer to  PROBLEM SYMPTOMS TABLE [06/2014 - 10/2016] 

Result: 

NG 

See step  2

1. Disconnect the K2 main body ECU (multiplex network body ECU) connector.
2. Disconnect the K72 radio receiver assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K2-28 (ACAN) - K72-3 (ADIM)	Always	Below 1 Ω
   K2-28 (ACAN) - 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 [04/2013 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR