Adaptive Cruise Control (ACC) Symptom Troubleshooting - ACC combination switch does not work (ACC system is OK)
ACC combination switch does not work (ACC system is OK)
1.
Gauge control module operation check:

Gauge control module operation check
?1.
Do the gauge control module self-diagnostic function.

Is the multi-information display (MID) OK?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
2.
ACC combination switch check 1:

ACC combination switch check 1
?1.
Check the parameter(s) below with the HDS pressing the MAIN switch, SET/? switch, RES/? switch, CANCEL switch, and DISTANCE switch of the ACC combination switch.
Signal
Current conditions
Values
Unit
MAIN switch
    
SET/? switch
    
RES/? switch
    
CANCEL switch
    
DISTANCE switch
    

Does it indicate ON when the appropriate switch is pressed, and OFF when the appropriate switch is released?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Any of the indicators turned ON and OFF, replace the ACC combination switch.?
     
NO
     
     
     
No indicator turned ON and OFF, go to step 4.
3.
Body electrical DTCs check:

Body electrical DTCs check
?1.
Check for DTCs with the HDS.
DTC Description
DTC
   

Are any DTCs indicated?

     
YES
     
     
     
Go to the indicated DTC's troubleshooting.?
     
NO
     
     
     
Check other related systems (PGM-FI system and VSA system).?
4.
ACC combination switch check 2:

ACC combination switch check 2
?1.
Test the ACC combination switch.

Is the switch OK?

     
YES
     
     
     
Check for poor connections or loose terminals between the gauge control module and the ACC combination switch. If OK, replace the gauge control module.?
     
NO