Pinpoint Tests AY: The Chime Sounds When The Driver Door Is Ajar (No Key In Ignition And Headlamps Off)
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test AY: The Chime Sounds When The Driver Door Is Ajar (No Key In Ignition And Headlamps Off)
Refer to Wiring Diagram Set 60 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Instrument Cluster for schematic and connector information. Diagrams By Number
Normal Operation
The Instrument Panel Cluster (IPC) receives the key-in-ignition warning status from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) communication bus.
The key-in-ignition warning switch (part of the ignition switch) is hardwired to the SJB through the key-in-ignition input circuit. When the key is inserted into the ignition lock cylinder, the key-in-ignition switch closes and supplies voltage to the SJB.
The SJB monitors the door ajar input from the LH front door and the key-in-ignition switch status. When the SJB detects a key-in-ignition voltage and the LH front door is open or ajar, the SJB sends the IPC a chime request message to sound the key-in-ignition warning chime.
- DTC B1352 (Ignition Key-In Circuit Failure) - an on-demand DTC that sets in the SJB if the SJB detects a short to voltage on the key-in-ignition switch input circuit or if the SJB detects ignition
START, RUN/START or RUN/ACC inputs without the key-in-ignition input.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Key-in-ignition warning switch (part of the ignition switch)
- SJB
PINPOINT TEST AY: THE CHIME SOUNDS WHEN THE DRIVER DOOR IS AJAR (NO KEY IN IGNITION AND HEADLAMPS OFF)
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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AY1 CHECK THE IPC ILLUMINATION
- Verify the IPC is not illuminated with the headlamp switch off.
- Does the IPC illumination operate correctly?
Yes
GO to AY2.
No
REFER to Instrument Panel, Gauges and Warning Indicators.
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AY2 RETRIEVE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check for recorded DTCs from the SJB self-test.
- Is DTC B1352 present?
Yes
GO to AY3.
No
GO to AY4.
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AY3 CHECK THE SJB IGNITION INPUT PIDs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger .
- Select and monitor the SJB PIDs ignition ACC (IGN_A_ECU), ignition OFF (IGN_O_ECU), ignition RUN (IGN_R_ECU), and ignition START (IGN_S_ECU) while cycling the ignition from ACC, OFF, RUN and START.
- Do the SJB PIDs match the ignition mode?
Yes
INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.
No
REFER to Steering Column to diagnose the ignition outputs to the SJB.
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AY4 CHECK THE KEY-IN-IGNITION INPUT CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280b .
- Measure the voltage between the SJB C2280b-35, circuit CDC30 (BU/GY), harness side and ground.
- Is any voltage present?
Yes
GO to AY5.
No
GO to AY6.
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AY5 CHECK THE KEY-IN-IGNITION INPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Ignition Switch C250 .
- Measure the voltage between the SJB C2280b-35, circuit CDC30 (BU/GY), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
INSTALL a new ignition switch. REFER to Steering Column. TEST the system for normal operation.
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AY6 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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 SJB. REFER to Body Control Systems. 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.
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