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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> On-Board Diagnostic - Start Stop Unit >> DTC B10C7-1F; Keyless Antenna (Interior, Rear) Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

DTC B10C7-1F; KEYLESS ANTENNA (INTERIOR, REAR) CIRCUIT MALFUNCTION - DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT KEYLESS ANTENNA (INTERIOR, REAR) CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the keyless antenna (interior, rear) connector.
  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
  • Is the connector normal?
Yes Go to the next step.
No Repair or replace the connector, then go to Step 7.
2 INSPECT LF CONTROL UNIT CONNECTOR CONDITION
  • Disconnect the LF control unit connector.
  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
  • Is the connector normal?
Yes Go to the next step.
No Repair or replace the connector, then go to Step 7.
3 INSPECT KEYLESS ANTENNA (INTERIOR, REAR) CIRCUIT FOR SHORT TO GROUND
  • Verify that the LF control unit and keyless antenna (interior, rear) connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Keyless antenna (interior, rear) terminal B
      • Keyless antenna (interior, rear) terminal A
  • Is there continuity?
Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • LF control unit terminal V-Keyless antenna (interior, rear) terminal B
  • LF control unit terminal T-Keyless antenna (interior, rear) terminal A

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.

Go to Step 7.
No Go to the next step.
4 INSPECT KEYLESS ANTENNA (INTERIOR, REAR) CIRCUIT FOR OPEN CIRCUIT
  • Verify that the LF control unit and keyless antenna (interior, rear) connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • LF control unit terminal V-Keyless antenna (interior, rear) terminal B
      • LF control unit terminal T- Keyless antenna (interior, rear) terminal A
  • Is there continuity?
Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • LF control unit terminal V-Keyless antenna (interior, rear) terminal B
  • LF control unit terminal T-Keyless antenna (interior, rear) terminal A

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 an open circuit.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has an open circuit.

Go to Step 7.
5 INSPECT LF CONTROL UNIT Yes Go to the next step.
No Replace the LF control unit, then go to Step 7.
(See LF CONTROL UNIT REMOVAL/INSTALLATION .)
6 VERIFY IF MALFUNCTIONING LOCATION IS KEYLESS ANTENNA (INTERIOR, REAR) DEPENDING ON REPEATABILITY Yes Replace the keyless antenna (interior, rear), then go to the next step.
(See KEYLESS ANTENNA REMOVAL/INSTALLATION .)
No Go to Step 8.
7 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
8 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [START STOP UNIT] .)
No DTC troubleshooting completed.