Meter Illumination does not Dim at Night: Procedure

1. Check if a CAN communication DTC is output. Refer to DIAGNOSIS SYSTEM .

   Result

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

B → See step   8 

A: Go to next step 

1. Check if DTC B1244 is output. Refer to DTC CHECK / CLEAR .

   Result

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

B → See step   6 

A: Go to next step 

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.

B → See step   9 

A: Go to next step 

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 that the taillights and low beam headlights.

   OK

   The taillights and low beam headlights come on.

5. Uncover the automatic light control sensor.
6. Check that 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

B → See step   7 

A: Go to next step 

1. Replace the main body ECU (multiplex network body ECU) with a new or a known good one. Refer to REMOVAL .

   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.

NG → See step   9 

OK → END