Pinpoint Test Q: DTC U3003:16

Cruise Control

Pinpoint Test Q: DTC U3003:16

Refer to Wiring Diagram Set 31, Cruise Control for schematic and connector information Electrical Diagrams.

Normal Operation

- DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold)- set by the Cruise-Control Module (C-CM) as a continuous memory and on-demand DTC if the C-CM (Cruise-Control Module) detects low battery voltage below 9.5 volts for more than 500 ms.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- High circuit resistance

- C-CM (Cruise-Control Module)

PINPOINT TEST Q : DTC U3003:16

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 results in false resistance readings.

Q1 RECHECK THE C-CM (Cruise-Control Module) DTCs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: C-CM (Cruise-Control Module) Self-Test.

- Clear the DTCs. Repeat the C-CM (Cruise-Control Module) self-test.

Is DTC U3003:16 still present?

Yes
GO to Q2.

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

Q2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM

- Enter the following diagnostic mode on the scan tool: PCM Self-Test.

- Retrieve the continuous memory DTCs from the PCM.

Are any charging system DTCs present in the PCM?

Yes
REFER to Charging System.

No
GO to Q3.

Q3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

- Check the battery condition and verify that the battery is fully charged.

Is the battery OK and fully charged?

Yes
GO to Q4.

No
REFER to Battery.

Q4 CHECK THE C-CM (Cruise-Control Module) VOLTAGE SUPPLY

- Ignition OFF.

- Measure and record the voltage at the battery.

- Disconnect: C-CM (Cruise-Control Module) C1582.

- Ignition ON.

- Measure the voltage between the C-CM (Cruise-Control Module) C1582-1, circuit SBB79 (WH/RD), harness side and ground.






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

Yes
GO to Q5.

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

Q5 CHECK THE C-CM (Cruise-Control Module) GROUND CIRCUIT

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Measure the resistance between the C-CM (Cruise-Control Module) C1582-4, circuit GD120 (BK/GN), harness side and ground.






Is the resistance less than 5 ohms?

Yes
GO to Q6.

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

Q6 CHECK FOR CORRECT C-CM (Cruise-Control Module) OPERATION

- Disconnect the C-CM (Cruise-Control Module) connector.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the C-CM (Cruise-Control Module) 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 C-CM (Cruise-Control Module). REFER to Cruise-Control Module (C-CM) . 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.