Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 742 (KEY UNLOCK WARNING SYSTEM - DIAGNOSIS)UNLOCK WARNING SWITCH CIRCUITINSPECTION PROCEDURE

2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST BY HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON, driver's door close and push the hand-held tester main SW ON.
3. Select the item "KEY REMND BUZZER" in the ACTIVE TEST, and operate the key reminder buzzer.
  OK: Tuns Key reminder buzzer ON
  
  NG: Go to step 5
  
  OK: Go to next step.
READ VALUE OF HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main SW ON.
3. Select the item "KEY UNLK WRN SW" in the DATA LIST and read its value displayed on the hand-held tester.
  OK: ON: The key is in the IG key cylinder
  
  OFF: The key is not in the IG key cylinder
  
  OK Go to FLOW CHART (See DOOR COURTESY SWITCH ASSY (FOR FRONT DOOR) CIRCUIT )
  
  NG: Go to next step.
INSPECT UN-LOCK WARNING SWITCH ASSY
1. Remove the key un-lock warning switch assy.
2. Inspect the key un-lock warning switch assy continuity.
  
  Fig 1: Identifying Unlock Warning Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard:

Fig 2: Un-Lock Warning Switch Specified Condition Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE UN-LOCK WARNING SWITCH ASSY

OK: Go to next step.
CHECK WIRE HARNESS
1. Disconnect the B4 body ECU and U1 unlock warning switch connectors.
2. Check the continuity between the body ECU wire harness side connector and unlock warning switch wire harness side connector.
  Standard:
  
  Fig 4: Wire Harness Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
  
  OK: Go to next step.
CHECK WIRE HARNESS
1. Disconnect the U1 unlock warning switch connector.
2. Check the continuity between terminal 1 and the body ground.
  Standard:
  
  Fig 6: Wire Harness Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK REPLACE DRIVER SIDE JUNCTION BLOCK ASSY
  
  NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
CHECK WIRE HARNESS
1. Disconnect the B4 body ECU and C8 meter ECU connectors.
2. Check the continuity between the body ECU wire harness side connector and the meter ECU wire harness side connector.
  
  Fig 7: Identifying Terminals Of B4 And C8
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 8: Wire Harness Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
  
  OK: Go to COMBINATION METER (See HOW TO PROCEED WITH TROUBLESHOOTING )