Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Mazda >> 2021 >> CX-9 Signature >> Repair and Diagnosis (Single Page) >> Body & Frame >> Door Locks >> Symptom Troubleshooting - Security And Locks >> Lock/Unlock Operation Not Possible Using Remote Transmitter >> Diagnostic Procedure

Diagnostic Procedure

LOCK/UNLOCK OPERATION NOT POSSIBLE USING REMOTE TRANSMITTER DIAGNOSTIC PROCEDURE

Step Inspection Action
1 DETERMINE IF MALFUNCTION CAUSE IS DOOR LOCK
 Yes Troubleshooting completed. (Explain the contents of the servicing to the customer.)
No Go to the next step.
2 INSPECT ROOM FUSE CONDITION
  • Is the fuse (ROOM fuse) normal?
 Yes Go to the next step.
No Go to the next step.
  • If the fuse installation is poor:
    • Install the ROOM fuse properly.
    • If the fuse is blown:
      • Refer to the wiring diagram and verify whether or not there is a common connector between fuse and LF control unit terminal B.

        If there is a common connector:

      • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
        • Repair or replace the malfunctioning part.

          If there is no common connector:

        • Repair or replace the wiring harness which has a short to ground.
        • Replace the fuse.
        • If the fuse is damaged:
        • Replace the fuse.

      Go to Step 15.
3 INSPECT REMOTE TRANSMITTER BATTERY POWER
 Yes
NOTE:
  • If the KEY indicator light (green) flashes for approx. 30 s, the battery power of the remote transmitter is low.
Replace the remote transmitter battery and go to Step 15.(See REMOTE TRANSMITTER DISASSEMBLY/ASSEMBLY .)
No Go to the next step.
4 REGISTER REMOTE TRANSMITTER
 Yes Go to Step 15.
No Go to the next step.
5 VERIFY IF MALFUNCTION CAUSE IS EXTERNAL NOISE
  • Ask the customer malfunction condition.
  • Does the malfunction occur at the specified place where external noise is received such as a TV tower, electric power station, or a broadcast station?
 Yes System is normal. (Explain the customer that operation cannot be performed caused by external noise.)
No Go to the next step.
6 VERIFY IF MALFUNCTION CAUSE IS OPERATION OTHER THAN OPERATION PERMISSION CONDITION
  • Did the customer operate the remote transmitter with all the following conditions met?
    • All doors and liftgate are closed.
      • Ignition switched off (LOCK)
 Yes Go to the next step.
No System is normal. (Explain the customer operation condition.)
7 DETERMINE IF MALFUNCTION CAUSE IS NON-STANDARD EQUIPMENT
  • Did the malfunction occur after installing the following non-standard equipment?
    • Mobile telephone or radio set
    • Part with built-in microcomputer
    • Remote engine starter
      • TV
 Yes Go to the next step.
No Go to Step 9.
8 DETERMINE IF MALFUNCTION CAUSE IS NON-STANDARD EQUIPMENT
  • Disconnect the connector for nonstandard equipment.
  • Perform the lock/unlock operation using the remote transmitter.
  • Does it operate normally?
 Yes System is normal. (Explain to the customer that noise from the nonstandard equipment affected the operation.)
No Go to the next step.
9 VERIFY REMOTE TRANSMITTER BATTERY CONDITION
  • Visually inspect the remote transmitter battery for the following:
    • Method of battery insertion (polarity)
    • Battery type (CR2025)
    • Corrosion, soiling, deformation of battery terminals (plus/minus terminals).
      • Contact malfunction between the battery terminal and battery when battery is inserted
  • Is there any malfunction?
 Yes Battery insertion direction, battery type is incorrect:
  • Properly install the battery or replace the battery with a specified one (CR2025), then go to the next step.

    Battery terminal malfunction:

  • Clean corrosion and soiling, or repair or replace the terminal, then go to the next step.
No Go to Step 11.
10 VERIFY REMOTE TRANSMITTER OPERATION
  • Perform the lock/unlock operation using the remote transmitter.
  • Is the lock/unlock operation performed normally?
 Yes Troubleshooting completed.
No Go to the next step.
11 DETERMINE IF MALFUNCTION CAUSE IS REMOTE TRANSMITTER
NOTE:
  • For a monitor battery, use a new battery or one which operates normally on another vehicle.
  • Replace the battery in all the remote transmitters with a monitor-use battery. (See REMOTE TRANSMITTER DISASSEMBLY/ASSEMBLY .)
  • For each remote transmitter, verify that the remote transmitter operation indicator light (LED) illuminates when a button is operated.
  • Does operation indicator light (LED) for each remote transmitter operate?
 Yes Go to the next step.
No If the operation indicator light (LED) does not illuminate, replace the remote transmitter, then go to the Step 15.
12 DETERMINE IF MALFUNCTION CAUSE IS BATTERY
NOTE:
  • Inspect for all remote transmitters.
  • Inspect while the batteries for all of the remote transmitters are replaced with monitor-use batteries.
    • Perform the lock/unlock operation using all the remote transmitters.
    • Is the lock/unlock operation performed normally?
 Yes Replace the battery, then go to Step 15.
(See REMOTE TRANSMITTER DISASSEMBLY/ASSEMBLY .)
No Go to the next step.
13 INSPECT IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN START STOP UNIT AND GROUND
  • Verify that the start stop unit connector is disconnected.
  • Inspect for continuity between the following terminals (vehicle wiring harness).
    • Start stop unit terminal 1AF and ground
      • Start stop unit terminal 2B and ground
  • Is there continuity?
 Yes Go to the next step.
No
  • Repair or replace the wiring harness for an open circuit.
  • After repair, go to Step 15.
14 INSPECT IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN KEYLESS RECEIVER AND START STOP UNIT OR KEYLESS RECEIVER
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the keyless receiver and start stop unit connector.
  • Inspect for continuity between the following terminals (vehicle wiring harness).
    • Keyless receiver terminal A and start stop unit terminal 2Q
      • Keyless receiver terminal B and start stop unit terminal 2R
  • Is there continuity?
 Yes
  • Inspect the keyless receiver. If there is any malfunction, replace it. (See KEYLESS RECEIVER INSPECTION .)
  • After repair, go to the next step.
No
  • Repair or replace the wiring harness for an open circuit.
  • After repair, go to the next step.
15 VERIFY IF MALFUNCTION CAUSE WAS CORRECTED
  • Perform the lock/unlock operation using all the remote transmitters.
  • Is the lock/unlock operation performed normally?
 Yes Troubleshooting completed. (Explain the contents of the servicing to the customer.)
No If the malfunction has not been resolved, repeat the inspection from Step 1.
scientia non olet · About Mike's Workshop Manuals