Headlight Adjuster Control Unit Input Test

With HID Lamp:


1.Remove the dashboard lower cover.

2.Disconnect the 14P connecter (A) from the control unit (B).

3.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, make the following input tests at the connector.
    • If a test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the control unit must be faulty, replace it.

Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 
7 BLK Under all conditions Check for continuity to ground:
There should be continuity. 
  • Poor ground (G501, G601)
  • An open in the wire
 
14 LT BLU Under all conditions Check for voltage to ground:
There should be battery voltage. 
  • Faulty combination light switch control unit
  • An open in the wire
 
Headlights switch ON Check for voltage to ground:
There should be 1.5 V or less. 
1 YEL/BLU Ignition switch ON (II) Check for voltage to ground:
There should be battery voltage. 
  • Blown No. 21 (7.5A) fuse in the under-dash fuse/relay box
  • An open in the wire
 
4 BLU Ignition switch ON (II): raise the front of the vehicle, and rotate one wheel slowly while holding the other wheel. Check for voltage between the No. 4 (+) terminal and No. 7 (-) terminals:
There should be 0-5 V or more 0-5 V or more repeatedly. 
  • Faulty ECM/PCM
  • An open in the wire
 
5 RED Under all conditions Check for continuity between the No. 5 and No. 6 terminals:
There should be approximately 5 kW.
Check for continuity between the No. 3 and No. 6 terminals:
There should be between approximately 0.5 kW and 4.5 kW. 
  • Faulty front headlights adjuster sensor
  • An open in the wire
 
6 GRN 
3 WHT 
2 RED Under all conditions Check for continuity between the No. 2 and No. 9 terminals:
There should be approximately 5 kW.
Check for continuity between the No. 8 and No. 9 terminals:
There should be between approximately 0.5 kW and 4.5 kW. 
  • Faulty front headlights adjuster sensor
  • An open in the wire
 
9 YEL 
8 WHT 


Reconnect the 14P connector to the headlight adjuster control unit.
Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 
11 GRN/WHT Under all conditions Check for continuity to ground:
There should be continuity. 
  • Faulty headlights adjuster control unit
 
6 GRN 
9 YEL 
10 BLU/BLK Ignition switch ON (II) and headlight switch ON Check for voltage between the No. 10 (+) terminal and No. 11 (-) terminals:
There should be battery voltage. 
  • Faulty headlights adjuster leveling motors
  • Faulty headlights adjuster control unit
  • An open in the wire
 
11 GRN/WHT 
12 BLU/ORN Ignition switch ON (II) and headlight switch ON Check for voltage between the No. 12 (+) terminal and No. 11 (-) terminals:
There should be between approximately 2 V and battery voltage. 
  • Faulty headlights adjuster leveling motors
  • Faulty headlights adjuster control unit
  • An open in the wire
 
11 GRN/WHT