Meter Illumination does not Dim at Night [08/2015 - 08/2019]: Procedure

1. Check if a CAN communication DTC is output (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] ).
   RESULT
   
   

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

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )

Result: 

A 

See step  2

1. Check if DTC B1244 is output (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
   RESULT
   
   

   Result	Proceed to
   DTC B1244 is not output	A
   DTC B1244 is output	B

Result: 

B 

GO TO LIGHTING SYSTEM 

(Refer to DTC B1244: Light Sensor Circuit Malfunction [08/2015 - 08/2019] )

Result: 

A 

See step  3

1. Turn the engine switch on (IG).
2. Turn the light control switch to the tail, head, or AUTO position.
3. Cover the light control switch.
4. Check the heater control panel illumination.
   RESULT
   
   

   Result	Proceed to
   Heater control panel illumination does not operate normally	A
   Heater control panel illumination operates normally	B

   HINT: 

   Both the heater control panel and combination meter assembly illumination dim according to the dimmer signal. Therefore, when only the meter illumination does not dim at night, replace the combination meter assembly.

Result: 

B 

REPLACE COMBINATION METER ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

A 

See step  4

1. Turn the engine switch on (IG).
2. Turn the light control switch to the AUTO position.
3. Cover the automatic light control sensor.
4. Check the taillights and low beam headlights.

   OK

   The taillights and low beam headlights come on.

5. Uncover the automatic light control sensor.
6. Check the low beam headlights and taillights.

   OK

   The low beam headlights and taillights go off.

   RESULT
   
   

   Result	Proceed to
   Automatic light control system operates normally	A
   Automatic light control system does not operate normally	B

Result: 

B 

GO TO LIGHTING SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )

Result: 

A 

See step  5

1. Replace the main body ECU (multiplex network body ECU) with a new or normally functioning one (Refer to REMOVAL [08/2015 - 08/2019] ).
2. Check the operation of the combination meter assembly.

   OK

   The operation of the combination meter assembly returns to normal.

   HINT: 

   The meter CPU controls the meter illumination based on an auto dimmer signal from the main body ECU (multiplex network body ECU). If the meter does not dim when the light control switch is in the tail, head, or AUTO position at night, it may be for either of 2 reasons. The first reason is that the main body ECU (multiplex network body ECU) does not send an auto dimmer signal. The second is that the meter CPU does not dim the meter illumination even though the meter CPU receives an auto dimmer signal.

Result: 

OK 

END 

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )