Pinpoint Test W: DTC B1318 (Front Display Interface Module (FDIM))

Information and Entertainment System

Pinpoint Tests

Pinpoint Test W: DTC B1318 (Front Display Interface Module (FDIM))

Refer to Wiring Diagram Set 130, Audio System for schematic and connector information. Diagrams By Number

Normal Operation
- DTC B1318 (Battery Voltage Low) - set by the Front Display Interface Module (FDIM) when the supply voltage falls below 10 volts for greater than 10 seconds during normal operation or during the self-test.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- High circuit resistance
- FDIM



PINPOINT TEST W: DTC B1318 (FDIM)

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

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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W1 RECHECK THE FDIM DTCs


- Clear the FDIM DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Repeat the FDIM self-test.
- Is DTC B1318 still present?

Yes
GO to W2.

No
The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.

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W2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM


- Retrieve the continuous memory DTCs from all modules.
- Is DTC P0620, P0622, P0625, P0626 or P065B set in the PCM?

Yes
REFER to Charging System.

No
GO to W3.

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W3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE


- Check the battery condition and verify that the battery is fully charged. Refer to Battery.
- Is the battery OK and fully charged?

Yes
GO to W4.

No
REFER to Battery.

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W4 CHECK THE FDIM VOLTAGE SUPPLY


- Ignition OFF.
- Measure and record the voltage at the battery.
- Disconnect: FDIM.
- Ignition ON.
- Measure the voltage between the FDIM C2123-12, circuit SBP39 (WH/RD), harness side and ground.




- Is the voltage within 0.2 volt of the recorded battery voltage?

Yes
GO to W5.

No
REPAIR the circuit for high resistance. CLEAR the DTC. REPEAT the self-test.

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W5 CHECK THE FCIM GROUND CIRCUIT FOR CONTINUITY


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the FDIM C2123-8, circuit GD134 (BK/VT), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to W6.

No
REPAIR the circuit for high resistance. CLEAR the DTCs. REPEAT the self-test.

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W6 CHECK FOR CORRECT FDIM OPERATION


- Connect: Negative Battery Cable.
- Disconnect the FDIM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the FDIM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new FDIM. REFER to Front Display Interface Module (FDIM) Front Display Interface Module (FDIM). 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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