Pinpoint Test P: DTC B1318

Information and Entertainment System

Pinpoint Tests

Pinpoint Test P: DTC B1318

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

Normal Operation
- DTC B1318 (Battery Voltage Low) - set by the Satellite Digital Audio Receiver System (SDARS) module as a continuous DTC if the SDARS module detects low battery voltage below 10 volts for greater than 10 seconds on circuit 729 (RD/WH). The SDARS module does not check the circuit for voltage with the key in START.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- High circuit resistance
- SDARS module



PINPOINT TEST P: DTC B1318

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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P1 RECHECK THE SDARS MODULE DTCs


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

Yes
GO to P2.

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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P2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM


- Carry out the PCM self-test.
- Is DTC P0620, P0622, P0625, P0626 or P0656 set in the PCM?

Yes
REFER to Charging System.

No
GO to P3.

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P3 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 P4.

No
REFER to Battery.

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P4 CHECK THE SDARS MODULE VOLTAGE SUPPLY


- Ignition OFF.
- Measure and record the voltage at the battery.
- Disconnect: SDARS Module C4344.
- Ignition ON.
- Measure the voltage between the SDARS module C4344-9, circuit 729 (RD/WH), harness side and ground.




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

Yes
GO to P5.

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

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P5 CHECK THE SDARS MODULE GROUND CIRCUIT


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the SDARS module C4344-3, circuit 1204 (BK/OG), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to P6.

No
REPAIR the circuit for high resistance. TEST the system for normal operation.

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P6 CHECK FOR CORRECT SDARS MODULE OPERATION


- Disconnect the SDARS module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the SDARS module 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 SDARS module. REFER to Satellite Digital Audio Receiver System (SDARS) Module Removal and Replacement. 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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