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   5 

A: Go to next step 

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

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Illumination Rate Info	Illumination rate information/0 ms. to 2162.65 ms.	Value output according to ambient light levels	-

   Result

   Result	Proceed to
   The output value changes according to the ambient light levels.	A
   The output value does not change according to the ambient light levels.	B

B → See step   4 

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 ECU 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 ECU does not dim the meter illumination even though the meter ECU receives an auto dimmer signal.

NG → See step   6 

OK → END