Pinpoint Test G: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
Communications Network
Pinpoint Test G: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
Refer to Wiring Diagrams Set 14, Module Communications Network for schematic and connector information. Electrical Diagrams
Refer to Wiring Diagrams Set 130, Audio System for schematic and connector information. Electrical Diagrams
Normal Operation
The Accessory Protocol Interface Module (APIM) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- APIM (Accessory Protocol Interface Module)
PINPOINT TEST G : THE APIM (Accessory Protocol Interface Module) DOES NOT RESPOND TO THE SCAN TOOL
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.
G1 CHECK THE APIM (Accessory Protocol Interface Module) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: APIM (Accessory Protocol Interface Module) C2383.
- Ignition ON.
- Measure the voltage between the APIM (Accessory Protocol Interface Module) C2383-1, circuit 29-MC12 (OG/YE), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to G2.
No
VERIFY the Central Junction Box (CJB) fuse 151 (15A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool. Electrical Diagrams
G2 CHECK THE APIM (Accessory Protocol Interface Module) GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the APIM (Accessory Protocol Interface Module) C2383-37, circuit 91-MC12 (BK/YE), harness side and ground; and between the APIM (Accessory Protocol Interface Module) C2383-38, circuit 91-MC12 (BK/YE), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to G3.
No
REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
G3 CHECK THE HS-CAN (High Speed Controller Area Network) CIRCUITS BETWEEN THE APIM (Accessory Protocol Interface Module) AND THE DLC (Data Link Connector) FOR AN OPEN
- Measure the resistance between the APIM (Accessory Protocol Interface Module) C2383-53, circuit 4-EC1 (GY/RD), harness side and the DLC (Data Link Connector) C251-6, circuit 4-EC7 (GY/RD)/4-EC8 (GY/VT), harness side.
- Measure the resistance between the APIM (Accessory Protocol Interface Module) C2383-54, circuit 4-EC1 (GY/RD), harness side and the DLC (Data Link Connector) C251-14, circuit 5-EC7 (BU/RD)/5-EC8 (BU/WH), harness side.
Are the resistances less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to G4.
No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
G4 CHECK FOR CORRECT APIM (Accessory Protocol Interface Module) OPERATION
- Disconnect all the APIM (Accessory Protocol Interface Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the APIM (Accessory Protocol Interface Module) connectors and make sure they seat 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). CLEAR the DTCs. REPEAT the network test with the scan tool. 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.