Inspection Procedure

1. Confirm the symptoms.

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   Meter illumination does not change when operate the light control rheostat knob	A
   Dimmer function cannot be canceled	B

B: Go to step  6

A: Go to next step 

1. Connect the Techstream to the DLC3
2. Turn the engine switch on (IG)
3. Turn the Techstream on
4. Enter the following menus Body Electrical / Combination Meter / Data List
5. Check the values by referring to the table below.

   Combination Meter 

   DIAGNOSTIC NOTE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Light Control Rheostat	Light control rheostat/Min 0%, Max 100%	Turn the light control rheostat knob fully counterclockwise (0%)	-
   		Turn the light control rheostat knob fully clockwise (100%)

   OK: The value displayed on the Techstream gradually changes as the actual rheostat operation. 

NG: Go to step  4

OK: Go to next step 

1. Connect the Techstream to the DLC3
2. Turn the engine switch on (IG).
3. Turn the Techstream on
4. Enter the following menus: Body Electrical / Combination Meter / Data List
5. Check the values by referring to the table below

   Combination Meter 

   DIAGNOSTIC NOTE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Tail Cancel SW	Tail cancel switch/OFF or ON	OFF Light control rheostat position is except below	-
   		ON Turn the light control rheostat knob fully clockwise (Tail cancel switch is ON)	-

   OK: Condition displayed on the Techstream is the same as the actual light control rheostat knob position. 

NG: Go to step  7

OK: REPLACE COMBINATION METER  (See REMOVAL  )

1. Remove the light control rheostat
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   1 (E) - 4 (RV)	Turn the rheostat knob fully clockwise (MAX)	8 to 12kΩ
   1 (E) - 4 (RV)	Rheostat knob is between MIN. and MAX.	The value changes gradually (Between approx. 0 to 8 kΩ)
   1 (E) - 4 (RV)	Turn the rheostat knob fully counterclockwise (MIN.)	Approx. 0 Ω

Fig 1: Identifying Light Control Rheostat Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE LIGHT CONTROL RHEOSTAT  (See REMOVAL  )

OK: Go to next step 

1. Disconnect the J34 and J15 connectors
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   J34-14 (ET) - J15-1 (E)	Always	Below 1 Ω
   J34-9 (ILL+) - J15-3 (T)	Always	Below 1 Ω
   J34-21 (TR) - J15-4 (RV)	Always	Below 1 Ω
   J15-1 (E) - Body ground	Always	10 kΩ or higher
   J15-3 (T) - Body ground	Always	10 kΩ or higher
   J15-4 (RV) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying Harness And Connector (Combination Meter - Light Control Rheostat)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE COMBINATION METER  (See REMOVAL  )

1. Connect the Techstream to the DLC3
2. Engine switch on (IG)
3. Turn the Techstream on
4. Enter the following menus: Body Electrical / Combination Meter / Data List.
5. Check the values by referring to the table below.

   Combination Meter 

   DIAGNOSTIC NOTE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Tail Cancel SW	Tail cancel switch/OFF or ON	OFF Light control rheostat position is except below	-
   		ON Turn the light control rheostat knob fully clockwise (Tail cancel switch is ON)	-

   OK: Condition displayed on the Techstream is the same as the actual light control rheostat position. 

NG: Go to step 7 

OK: REPLACE COMBINATION METER  (See REMOVAL  )

1. Remove the light control rheostat
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   2 (TC) - 3 (T)	Light control rheostat knob position is except below	Below 1 Ω
   2 (TC) - 3 (T)	Turn the light control rheostat knob fully clockwise (Tail cancel switch is ON)	10 kΩ or higher

Fig 3: Identifying Light Control Rheostat Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE LIGHT CONTROL RHEOSTAT  (See REMOVAL  )

OK: Go to next step 

1. Disconnect the J34 and J15 connectors
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   J34-8 (TC) - J15-2 (TC)	Always	Below 1 Ω
   J15-2 (TC) - Body ground	Always	10 kΩ or higher
   J34-9 (ILL+) - J15-3 (T)	Always	Below 1 Ω
   J15-3 (T) - Body ground	Always	10 kΩ or higher

Fig 4: Identifying Harness And Connector (Combination Meter - Light Control Rheostat)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE COMBINATION METER  (See REMOVAL  )