Body Control Module (BCM)

B2199-16-BATTERY VOLTAGE - CIRCUIT VOLTAGE BELOW THRESHOLD





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously.

- Set Condition:
When the Body Control Module (BCM) detects a low voltage condition on both the (A903) and (A904) Fused B(+) circuits, where the voltage input is below 9.0 volts for more than one second.





1. CHECK FOR ANY POWERTRAIN DTCS

NOTE: Make sure the Battery is in good condition. Battery and perform the Battery System diagnostic procedure.

NOTE: Inspect the vehicle for after market accessories that may exceed the Generator System output.

NOTE: Make sure the generator drive belt is in good operating condition.

NOTE: Inspect the fuses in the Power Distribution Center (PDC). If an open fuse is found, use the wire diagram/schematic as a guide, inspect the wiring and connectors for damage.

1. With the scan tool, read PCM DTCs.

Are there any Battery or Charging System DTCs?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure for the charging system DTCs.

No

- Go To 2

2. TEST FOR INTERMITTENT CONDITION
1. Using the scan tool, record and erase the DTCs.
2. Start the engine and run for two minutes.
3. Using the scan tool, read the Active DTCs.

Does the scan tool display DTC: B2199-16-BATTERY VOLTAGE - CIRCUIT VOLTAGE BELOW THRESHOLD as active?

Yes

- Go To 3

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE (A903) AND (A904) FUSED B(+) CIRCUITS FOR HIGH RESISTANCE




1. Disconnect the BCM B and C harness connectors.
2. Using a 12-volt test light connected to ground, check the (A903) Fused B(+) circuit in the BCM C harness connector.
3. Using a 12-volt test light connected to ground, check the (A904) Fused B(+) circuit in the BCM B harness connector.

NOTE: Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly for both circuits?

Yes

- Go To 4

No

- Repair the (A903) and (A904) Fused B(+) circuits for high resistance.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (Z922) GROUND CIRCUIT FOR HIGH RESISTANCE




1. Using a 12-volt test light connected to 12-volts, check the (Z922) Ground circuit in the BCM B and C harness connectors.

NOTE: Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Replace the Body Control Module (BCM). Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the (Z922) Ground circuit for high resistance.
- Perform the BODY VERIFICATION TEST. Body Verification Test.