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

Information and Entertainment System

Pinpoint Tests

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

Normal Operation
- DTC B1318 (Battery Voltage Low) - set by the Front Display Interface Module (FDIM) when the supply voltage on circuit SBP14 (BN/RD) falls below 10 volts for at least 10 seconds during normal operation. This DTC applies to vehicles without navigation only.

This pinpoint test is intended to diagnose the following:

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



PINPOINT TEST AI: DTC B1318 (FDIM)

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

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AI1 RECHECK THE FDIM DTCs


- Ignition ON.
- Clear the FDIM DTCs.
- Wait at least 15 seconds.
- Repeat the FDIM self-test.
- Is DTC B1318 still present?

Yes
GO to AI2.

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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AI2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM


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

Yes
REFER to Charging System.

No
GO to AI3.

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AI3 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 AI4.

No
REFER to Battery.

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AI4 CHECK THE FDIM VOLTAGE SUPPLY


- Ignition OFF.
- Measure and record the voltage at the battery.
- Disconnect: FDIM C2123 .
- Ignition ON.
- Measure the voltage between the FDIM C2123-12, circuit SBP14 (BN/RD), harness side and ground.




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

Yes
GO to AI5.

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

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AI5 CHECK THE FDIM GROUND CIRCUIT


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the FDIM C2123-8, circuit GD114 (BK/BU), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to AI6.

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

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AI6 CHECK FOR CORRECT FDIM OPERATION


- Ignition OFF.
- 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 determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new FDIM. REFER to Front Display Interface Module (FDIM) - Without Navigation Front Display Interface Module (FDIM) - Without Navigation. 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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