Pinpoint Test J: Panic Feature Is Inoperative Or Does Not Operate Correctly

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Horn/Cigar Lighter for schematic and connector information.

Normal Operation

A network message is supplied to the lighting control module (LCM) from the driver door module (DDM) to sound the horn and flash the parking lamps. When the panic feature is activated, the LCM grounds circuit 1 (DB), energizing the horn relay and flashing the parking lamps.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Remote keyless entry (RKE) transmitter
LCM
DDM

PINPOINT TEST J: PANIC FEATURE IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY

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

J1 CHECK THE DOOR LOCK OPERATION FROM THE RKE TRANSMITTERS
- Press the lock and unlock buttons on the RKE transmitters.
- Do the locks lock and unlock?
1. YES : Go to J2.
2. NO : Go to Pinpoint Test N .
J2 CHECK THE PANIC FEATURE FROM THE RKE TRANSMITTERS
- Press the panic button on the RKE transmitters.
- Does the horn sound?
1. YES : Go to J3.
2. NO : Go to J4.
J3 CHECK THE PARKING LAMPS FOR CORRECT OPERATION
- Turn the parking lamps ON.
- Do the parking lamps illuminate?
1. YES : Go to J7.
2. NO : REFER to EXTERIOR LIGHTING article.
J4 CHECK THE HORN OPERATION
- Press the horn switch.
- Does the horn sound?
1. YES : Go to J5.
2. NO : REFER to HORN article.
J5 CHECK THE HORN CIRCUIT OUTPUT FROM THE LCM
- Connect the diagnostic tool.
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: LCM DataLogger
- Trigger the LCM HORN active command On.
- Does the horn sound?
1. YES : Go to J8.
2. NO : Go to J6.
J6 CHECK CIRCUIT 1 (DB) FOR AN OPEN
- Key in OFF position.
- Disconnect: LCM C2145b
- Disconnect: Horn Relay
- Measure the resistance between the LCM C2145b-7, circuit 1 (DB), harness side and horn relay, circuit 1 (DB), harness side.
- Is the resistance less than 5 ohms?
1. YES : Go to J7.
2. NO : REPAIR the circuit. TEST the system for normal operation.
J7 CHECK FOR CORRECT LCM OPERATION
- Disconnect all LCM connectors.
- Check for:
  - corrosion
  - damaged pins
  - 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?
1. YES : INSTALL a new LCM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. CLEAR the DTCs. REPEAT the self-test.
2. 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.
J8 CHECK FOR CORRECT DDM OPERATION
- Disconnect all DDM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all DDM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new DDM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. PROGRAM all the remote keyless entry (RKE) transmitters. REFER to Remote Keyless Entry Transmitter Programming . CLEAR the DTCs. REPEAT the self-test.
2. 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.