Pinpoint Test C: The Key-In-Ignition Warning Chime Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

C1 CHECK THE LCM FOR STORED DIAGNOSTIC TROUBLE CODES (DTCs)
- Check for recorded LCM DTCs from the continuous and on-demand self-tests.
- Is DTC B1352 present?
Yes : GO to C3.

No : GO to C2.
C2 CHECK THE INTERIOR LAMPS OPERATION
- Open the driver door and observe the interior lamps operation.
- Do the interior lamps operate correctly?
Yes : GO to C5.

No : REFER to INTERIOR LIGHTING to continue diagnosis of the interior lamps.
C3 CHECK CIRCUIT 158 (BK/PK) FOR VOLTAGE
- Disconnect: LCM C2145a.
- Insert the key into the ignition lock cylinder.
- Measure the voltage between the LCM C2145a-10, circuit 158 (BK/PK), harness side and ground.
  
  Fig 1: Measuring Voltage Between LCM C2145A-10, Circuit 158 (BK/PK), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to C5.

No : GO to C4.
C4 CHECK THE IGNITION SWITCH FOR CORRECT OPERATION
- Disconnect: Ignition Switch C250.
- Carry out the ignition switch component test. Refer to COMPONENT TESTING .
- Does the ignition switch pass the component test?
Yes : VERIFY the battery junction box (BJB) fuse 1 (20A) is OK. If OK, REPAIR circuit 158 (BK/PK). CLEAR the DTCs. REPEAT the self-test.

No : INSTALL a new ignition switch. REFER to STEERING COLUMN SWITCHES . CLEAR the DTCs. REPEAT the self-test.
C5 CHECK FOR CORRECT LCM OPERATION
- Disconnect all LCM connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all LCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new LCM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.