Pinpoint Test A: DTC B1317/B1318

Vehicle Dynamic Suspension

Pinpoint Tests

Pinpoint Test A: DTC B1317/B1318

Refer to Wiring Diagram Set 41, Vehicle Dynamic Suspension for schematic and connector information. Diagrams By Number

Normal Operation

Fused ignition switch voltage is provided to the Vehicle Dynamics Module (VDM) from Central Junction Box (CJB) fuse 13 (10A) along circuit 1003 (GY/YE). Fused battery voltage is provided to the VDM from battery junction box (BJB) fuse 5 (10A) along circuit 418 (DG/YE). Ground for the VDM is provided along circuit 57 (BK) and the VDM communicates with the other modules on the Controller Area Network (CAN) bus along circuits 1828 (PK/LG) and 1827 (WH/LG).

- DTC B1317 (Battery Voltage High) - With the ignition key in the RUN position, if battery voltage exceeds 18 volts for more than 500 ms, DTC B1317 will be set.
- DTC B1318 (Battery Voltage Low) - With the ignition key in the RUN position, if battery voltage falls below 8.5 volts for more than 500 ms, DTC B1318 will be set.

This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- VDM



PINPOINT TEST A: DTC B1317/B1318

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

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A1 CHECK THE BATTERY VOLTAGE


NOTE: A recent jump start can cause these DTCs to set.

- Measure the battery voltage between the positive and negative battery posts with the Key ON Engine OFF (KOEO) and with the engine running.
- Is the battery voltage between 10 and 13 volts with KOEO, and between 11 and 17 volts with the engine running?

Yes
GO to A2.

No
REFER to Diagnosis and Testing in Charging System. Testing and Inspection

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A2 CHECK FOR VOLTAGE TO THE VDM


- Ignition OFF.
- Disconnect: VDM C2131a.
- Ignition ON.
- Measure the voltage between ground and:
- VDM C2131a-3, circuit 1003 (GY/YE), harness side.
- VDMC2131a-11, circuit 418 (DG/YE), harness side.
- VDM C2131a-12, circuit 418 (DG/YE), harness side.




- Is the voltage greater than 10 volts and less than 17 volts?

Yes
GO to A3.

No
VERIFY CJB fuse 13 (10A) is OK. If OK, REPAIR circuit 1003 (GY/YE). If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.

VERIFY BJB fuse 5 (10A) is OK. If OK, REPAIR circuit 418 (DG/YE). If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.

CLEAR the DTCs. REPEAT the self-test.

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A3 CHECK CIRCUIT 57 (BK) FOR AN OPEN


- Ignition OFF.
- Measure the resistance between ground and:
- VDM C2131a-14, circuit 57 (BK), harness side.
- VDM C2131a-5, circuit 57 (BK) harness side.




- Is the resistance less than 5 ohms?

Yes
INSTALL a new VDM. REFER to Vehicle Dynamics Module (VDM) Service and Repair. CLEAR the DTCs. REPEAT the self-test.

No
REPAIR circuit 57 (BK). CLEAR the DTCs. REPEAT the self-test.

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