Meter Illumination does not Dim at Night: Procedure

1. Check for DTCs. Refer to DTC CHECK / CLEAR [01/2012 - ] .
   RESULT
   
   

   Result	Proceed to
   CAN communication system DTC is not output	A
   CAN communication system DTC is output	B

B → See step   5 

A: Go to next step 

1. Operate the Techstream according to the display and select the Data List. Refer to DATA LIST / ACTIVE TEST [01/2012 - ] .
   COMBINATION METER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Tail Cancel SW	TAIL cancel switch condition/ON or OFF	ON: TAIL cancel switch on OFF: TAIL cancel switch off	-
   Rheostat value	Light control rheostat switch input/Min.: 0, Max.: 100	Light control rheostat switch is fully turned left (0) → fully turned right (100)	Unit: %

   OK

   Light brightness can be changed within specified range by manual operation.

NG → See step   6 

OK: Go to next step 

1. Inspect the light control rheostat.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   1. Remove the light control rheostat. Refer to REMOVAL [01/2012 - ] .
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Switch Condition	Specified Condition
      6 (TC) - 5 (T)	TAIL cancel switch off → on	10 kΩ or higher → Below 1 Ω
      5 (T) - 1 (E)	Always	10 kΩ +/-20%
      7 (TR) - 1 (E)	Light control rheostat fully turned right → fully turned left	10 kΩ +/-20% → Below 100 Ω

2. Inspect the ODO/TRIP switch.
   1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Switch Condition	Specified Condition
      4 (A/B) - 1 (E)	ODO/TRIP switch on (Pushed)	Below 100 Ω
      	ODO/TRIP switch off (Not pushed)	1 MΩ or higher

NG → See step   7 

OK: Go to next step 

1. Disconnect the E77 meter connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the E9 rheostat connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E77-32 (ILL+) - E9-5 (T)	Always	Below 1 Ω
   E77-33 (TR) - E9-7 (TR)
   E77-34 (E2) - E9-1 (E)
   E77-31 (TC) - E9-6 (TC)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8