Keyless/Power Door Lock System (Multiplex Control Unit) Input Test - With Super Locking

NOTE: For the hatch glass unlock button test, refer to the rear wiper control unit input test.

1.Before testing, troubleshoot the multiplex control system.

2.Remove the dashboard lower cover.

3.Disconnect the under-dash fuse/relay box connectors.

NOTE: All connectors 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.Reconnect the connectors, and 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 
J2 WHT/RED Under all conditions Check for voltage to ground:
There should be battery voltage. 
  • Blown No. 9 (10A) fuse in the under-hood fuse/relay box
  • An open in the wire
 
J7 WHT Under all conditions Check for voltage to ground:
There should be battery voltage. 
  • Blown No. 16 (20A) fuse in the under-hood fuse/relay box
  • An open in the wire
 
K2 BLU/ORN Under all conditions Check for continuity between the K2 terminal and the keyless receiver unit 5P connector No. 2 terminal with the 5P connector disconnected:
There should be continuity. 
  • An open in the wire
 
M6 YEL/BLK Connect J7 terminal to M7[or M8]terminal, and M8[or M7]terminal to F3 terminal. Check actuator operation:
The front passenger's door lock actuator should lock[or unlock]. 
  • Blown No. 16 (20A) fuse in the under-hood fuse/relay box
  • Faulty actuator
  • Faulty super locking control unit
  • An open in the wire
 
M8 YEL 
M7 YEL/BLK Connect J7 terminal to M6[or M9]terminal, and M9[or M6]terminal to F3 terminal. Check actuator operation:
The driver's door lock actuator should lock[or unlock]. 
  • Blown No. 16 (20A) fuse in the under-hood fuse/relay box
  • Faulty actuator
  • Faulty super locking control unit
  • An open in the wire
 
M9 YEL/GRN 
P17 YEL/BLK Connect J7 terminal to P17[or P16]terminal, and P16[or P17] terminal to F3 terminal. Check actuator operation:
The left rear door, right rear door and tailgate lock actuator should lock [or unlock]. 
  • Blown No. 16 (20A) fuse in the under-hood fuse/relay box
  • Faulty actuator
  • Faulty left rear or right rear super locking control unit.
  • An open in the wire
 
P16 YEL 
J4 BLK Under all conditions Check for continuity to ground:
There should be continuity. 
  • Poor ground (G301)
  • An open in the wire
 

6.Reconnect all connector to the under-dash fuse/relay box, and make sure these input tests at the appropriate connectors on the under-dash fuse/relay box

  • If any test indicates a problem, find and correct the cause, then recheck the system.
  • If all the input tests prove OK, the multiplex control unit 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 
P18 RED Tailgate open Check for voltage to ground:
There should be 1 V or less. 
  • Poor ground (G601)
  • Faulty tailgate latch switch
  • An open in the wire
 
Tailgate closed Check for voltage to ground:
There should be 5 V or more. 
X5 RED/WHT Ignition key inserted into the ignition switch Check for voltage to ground:
There should be 1 V or less. 
  • Poor ground (G401)
  • Faulty ignition key switch
  • An open in the wire
 
Ignition key removed from the ignition switch Check for voltage to ground:
There should be 5 V or more. 
Q3 GRN Driver's door open Check for voltage to ground:
There should be 1 V or less. 
  • Faulty driver's door switch
  • An open in the wire
 
Driver's door closed Check for voltage to ground:
There should be 5 V or more. 
Q4 LT GRN/RED Passenger's door open Check for voltage to ground:
There should be 1 V or less. 
  • Faulty passenger's door switch
  • An open in the wire
 
Passenger's door closed Check for voltage to ground:
There should be 5 V or more. 
Y4 BLU Front passenger's, tailgate, left rear or right rear door lock knob switch unlocked Check for voltage to ground:
There should be 1 V or less. 
  • Faulty front passenger's, tailgate, left rear or right rear door lock knob switch
  • Poor ground (G502, G551, G552, G601, G701)
  • An open in the wire
 
X6 WHT/RED Driver's door key cylinder switch lock Check for voltage to ground:
There should be 1 V or less. 
  • Faulty driver's door key cylinder switch
  • Poor ground (G501)
  • An open in the wire
 
Driver's door key cylinder switch in neutral Check for voltage to ground:
There should be 5 V or more. 
Y13 WHT Driver's door key cylinder switch unlocked Check for voltage to ground:
There should be 1 V or less. 
Driver's door key cylinder switch in neutral Check for voltage to ground:
There should be 5 V or more. 
Y7 WHT/BLK Driver's door lock knob switch unlocked Check for voltage to ground:
There should be less than 1 V. 
  • Poor ground (G501)
  • Faulty driver's door lock knob switch
  • An open in the wire
 
Driver's door lock knob switch locked Check for voltage to ground:
There should be 5 V or more. 
  • Faulty driver's door lock knob switch
  • Short to ground
 
Y8 YEL/RED Driver's door lock knob switch locked Check for voltage to ground:
There should be 1 V or less. 
  • Poor ground (G501)
  • Faulty driver's door lock knob switch
  • An open in the wire
 
Driver's door lock knob switch unlocked Check for voltage to ground:
There should be 5 V or more. 
  • Faulty driver's door lock knob switch
  • Short to ground
 
Y2 BLU/ORN Under all conditions Check for continuity between the Y2 terminal and the security control unit A17 terminal with the security control unit 20P connector disconnected:
There should be continuity. 
  • An open in the wire
 
Y3 LT GRN/BLK Under all conditions Check for continuity between the Y3 terminal and the security control unit A6 terminal with the security control unit 20P connector disconnected:
There should be continuity. 
  • An open in the wire
 
P2 BLK/YEL Press the keyless transmitter hatch glass unlock button Check for voltage to ground:
There should be battery voltage for a moment. 
  • Poor ground (G601, G701)
  • Faulty hatch glass opener actuator
  • An open in a wire