MICU Input Test

1.Turn the ignition switch OFF.

2.Remove the driver's dashboard lower cover.

3.Disconnect the under-dash fuse/relay box connectors E, F, K, and T.

NOTE: All connector views are wire side of female terminals.

 

4.Inspect the connector and socket terminals to be sure they are all making good contact.

  • If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.
  • If the terminals look OK, go to 5.

5.With the under-dash fuse/relay box connectors and MICU connectors still disconnected, make these input tests at the connector.

  • If any test indicates a problem, find and correct the cause, then recheck the system.
  • If all the input tests prove OK, go to 6.

Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 
K4 PNK Under all conditions (With sunroof: map light switch in DOOR position) Attach to ground:
The ceiling light and map lights* should come on. 
  • Blown No. 22 (7.5 A) fuse in the under-hood fuse/relay box
  • Blown bulb(s)
  • Faulty ceiling light
  • Faulty map light
  • An open in the wire
 

*: With sunroof 

6.Reconnect the under-dash fuse/relay box connectors and MICU connectors, then make these input tests at the connector.

  • If any test indicates a problem, find and correct the cause, then recheck the system.
  • If all the input tests prove OK, the MICU must be faulty; replace the under-dash fuse/relay box assembly.

Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 
E6 BLK Under all conditions Check for voltage to ground:
There should be less than 0.5 V. 
  • Poor ground (G602)
  • An open in the wire
 
E33 BLK Under all conditions Check for voltage to ground:
There should be less than 0.5 V. 
  • Poor ground (G601)
  • An open in the wire
 
F20 BLK Under all conditions Check for voltage to ground:
There should be less than 0.5 V. 
  • Poor ground (G401)
  • An open in the wire
 
T34 BLK Under all conditions Check for voltage to ground:
There should be less than 0.5 V. 
  • Poor ground (G501)
  • An open in the wire