Pinpoint Test AC: DTC U3003:16 (Accessory Protocol Interface Module (APIM) )

Information and Entertainment System

Pinpoint Test AC: DTC U3003:16 (Accessory Protocol Interface Module (APIM))

Refer to Wiring Diagram Set 130, Audio System for schematic and connector information Electrical Diagrams.

Normal Operation

- DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold)- set by the Accessory Protocol Interface Module (APIM) when the supply voltage falls below 10 volts for at least 10 seconds during normal operation, or for more than 250 ms during the self-test.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- High circuit resistance

- APIM (Accessory Protocol Interface Module)

PINPOINT TEST AC : DTC U3003:16 (APIM (Accessory Protocol Interface Module))

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.

AC1 RECHECK THE APIM (Accessory Protocol Interface Module) DTCs

- Clear the APIM (Accessory Protocol Interface Module) DTCs.

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

- Repeat the APIM (Accessory Protocol Interface Module) self-test.

Is DTC U3003:16 still present?

Yes
GO to AC2.

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

AC2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM

- Retrieve the continuous memory DTCs from all modules.

Are any low voltage DTCs set in the PCM?

Yes
REFER to Charging System.

No
GO to AC3.

AC3 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 AC4.

No
REFER to Battery.

AC4 CHECK THE APIM (Accessory Protocol Interface Module) VOLTAGE SUPPLY

- Ignition OFF.

- Measure and record the voltage at the battery.

- Disconnect: APIM (Accessory Protocol Interface Module) C2383.

- Ignition ON.

- Measure the voltage between the APIM (Accessory Protocol Interface Module) C2383-1, circuit SBP10 (YE/RD), harness side and ground.





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

Yes
GO to AC5.

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

AC5 CHECK THE APIM (Accessory Protocol Interface Module) GROUND CIRCUIT FOR CONTINUITY

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Measure the resistance between the APIM (Accessory Protocol Interface Module) C2383-37, circuit GD111 (BK/BU), harness side and ground; and between the APIM (Accessory Protocol Interface Module) C2383-38, circuit GD111 (BK/BU), harness side and ground.





Are the resistances less than 5 ohms?

Yes
GO to AC6.

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

AC6 CHECK FOR CORRECT APIM (Accessory Protocol Interface Module) OPERATION

- Connect: Negative Battery Cable.

- Disconnect the APIM (Accessory Protocol Interface Module) connector.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the APIM (Accessory Protocol Interface 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 APIM (Accessory Protocol Interface Module). REFER to Accessory Protocol Interface Module (APIM) Accessory Protocol Interface Module (APIM). 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.