Part 1

Communications Network

Pinpoint Test X: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding


Normal Operation

The Medium Speed Controller Area Network (MS-CAN) uses an unshielded twisted pair cable MS-CAN (Medium Speed Controller Area Network) (+) and MS-CAN (Medium Speed Controller Area Network) (-).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Accessory Protocol Interface Module (APIM) (if equipped)

- Audio Control Module (ACM)

- Global Positioning System Module (GPSM) (if equipped)

- Circuit Deactivation Ignition Module (CDIM) (diesel engine only, if equipped)

- Dual Climate Controlled Seat Module (DCSM) (if equipped)

- Driver Seat Module (DSM) (if equipped)

- HVAC module

- Tire Pressure Monitor Module (TPM)

- Satellite Digital Audio Receiver System (SDARS) module (if equipped)

- Body Control Module (BCM)

PINPOINT TEST X : NO MS-CAN (Medium Speed Controller Area Network) COMMUNICATION, ALL MODULES ARE NOT RESPONDING

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test. Inspection and Verification

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.

X1 CHECK THE DLC (Data Link Connector) PINS FOR DAMAGE

- Ignition OFF.

- Disconnect the scan tool cable from the Data Link Connector (DLC).

- Inspect DLC (Data Link Connector) pins 3 and 11 for damage.





Are DLC (Data Link Connector) pins 3 and 11 OK?

Yes
GO to X2.

No
REPAIR the DLC (Data Link Connector) as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.

X2 CHECK THE MS-CAN (Medium Speed Controller Area Network) TERMINATION RESISTANCE

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance between 54 and 66 ohms?

Yes
GO to X3.

No
GO to X5.

X3 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side and ground.





Are the resistances greater than 1,000 ohms?

Yes
CONNECT the negative battery cable. GO to X4.

No
GO to X23.

X4 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO VOLTAGE

- Ignition ON.

- Measure the voltage between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side and ground.





Is the voltage greater than 6 volts?

Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
The Controller Area Network (CAN)
has tested within specifications. GO to Pinpoint Test W to diagnose the intermittent MS-CAN (Medium Speed Controller Area Network) fault. Pinpoint Test W: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo

X5 CHECK THE MS-CAN (Medium Speed Controller Area Network) TERMINATION RESISTOR

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance between 108 and 132 ohms?

Yes
GO to X6.

No
GO to X9.

X6 CHECK THE MS-CAN (Medium Speed Controller Area Network) TERMINATION RESISTOR WITH THE BCM (Body Control Module) DISCONNECTED

- Disconnect: BCM (Body Control Module) C2280B.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance between 108 and 132 ohms?

Yes
GO to X7.

No
GO to X8.

X7 CHECK THE MS-CAN (Medium Speed Controller Area Network) CIRCUITS BETWEEN THE BCM (Body Control Module) AND THE DLC (Data Link Connector) FOR AN OPEN

- Measure the resistance between the BCM (Body Control Module) C2280B-38, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side.





- Measure the resistance between the BCM (Body Control Module) C2280B-39, circuit VDB07 (VT/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to X35.

No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.

X8 CHECK THE MS-CAN (Medium Speed Controller Area Network) CIRCUITS BETWEEN THE HVAC Module AND THE DLC (Data Link Connector) FOR AN OPEN

- Disconnect: HVAC Module C228.

- Measure the resistance between the HVAC Module C228-12, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side.





- Measure the resistance between the HVAC module C228-13, circuit VDB07 (VT/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to X37.

No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.

X9 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
GO to X11.

No
GO to X10.

X10 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR AN OPEN

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance greater than 10,000 ohms?

Yes
REPAIR the DLC (Data Link Connector) or REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
A capacitor internal to a module may still be draining causing irregular resistance readings. WAIT 5 minutes. REPEAT the pinpoint test.

X11 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE BCM (Body Control Module) DISCONNECTED

- Disconnect: BCM (Body Control Module) C2280B.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
If the vehicle is equipped with a SDARS (Satellite Digital Audio Receiver System) module, GO to X12.

If the vehicle is not equipped with a SDARS (Satellite Digital Audio Receiver System) module, GO to X13.

No
CONNECT the negative battery cable. GO to X35.

X12 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SDARS (Satellite Digital Audio Receiver System) MODULE DISCONNECTED

- Disconnect: SDARS (Satellite Digital Audio Receiver System) Module C2358.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
GO to X13.

No
CONNECT all modules. CONNECT the negative battery cable. GO to X36.

X13 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TPM (Tire Pressure Monitor Module) DISCONNECTED

- Disconnect: TPM (Tire Pressure Monitor Module) C2415.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
If the vehicle is equipped with a DSM (Driver Seat Module), GO to X14.

If the vehicle is not equipped with a DSM (Driver Seat Module), GO to X15.

No
CONNECT all modules. CONNECT the negative battery cable. GO to X41.

X14 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE DSM (Driver Seat Module) DISCONNECTED

- Disconnect: DSM (Driver Seat Module) C341D.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
GO to X15.

No
CONNECT all modules. CONNECT the negative battery cable. GO to X38.

X15 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ACM (Audio Control Module) DISCONNECTED

- Disconnect: ACM (Audio Control Module) C240C (If Equipped).

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
If the vehicle is equipped with an APIM (Accessory Protocol Interface Module), GO to X16.

If the vehicle is not equipped with an APIM (Accessory Protocol Interface Module), GO to X17.

No
CONNECT all modules. CONNECT the negative battery cable.

For ACM (Audio Control Module), GO to X39.

X16 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE APIM (Accessory Protocol Interface Module) DISCONNECTED

- Disconnect: APIM (Accessory Protocol Interface Module) C2298.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
GO to X17.

No
CONNECT all modules. CONNECT the negative battery cable. GO to X40.

X17 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE HVAC module DISCONNECTED

- Disconnect: HVAC module C228.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
If the vehicle is equipped with a DCSM (Dual Climate Controlled Seat Module), GO to X18.

If the vehicle is not equipped with a DCSM (Dual Climate Controlled Seat Module), GO to X21.

No
CONNECT all modules. CONNECT the negative battery cable. GO to X37.

X18 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE DCSM (Dual Climate Controlled Seat Module) DISCONNECTED

- Disconnect: DCSM (Dual Climate Controlled Seat Module) C3265C.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
GO to X19.

No
CONNECT all modules. CONNECT the negative battery cable. GO to X42.

X19 VERIFY VEHICLE EQUIPMENT - GPSM (Global Positioning System Module)

- Verify whether the vehicle is equipped with a Global Positioning System Module (GPSM).

Is the vehicle equipped with a GPSM (Global Positioning System Module) ?

Yes
GO to X20.

No
GO to X21

X20 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE GPSM (Global Positioning System Module) DISCONNECTED

- Disconnect: GPSM (Global Positioning System Module) C2398.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
GO to X21.

No
CONNECT all modules. CONNECT the negative battery cable. GO to X43.

X21 VERIFY VEHICLE EQUIPMENT - CDIM (Circuit Deactivation Ignition Module)

- Verify whether the vehicle is equipped with a Circuit Deactivation Ignition Module (CDIM).

Is the vehicle equipped with a CDIM (Circuit Deactivation Ignition Module) ?

Yes
GO to X22.

No
REPAIR the circuits. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.

X22 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE CDIM (Circuit Deactivation Ignition Module) DISCONNECTED

- Disconnect: CDIM (Circuit Deactivation Ignition Module) C2500.

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), harness side.





Is the resistance less than 5 ohms?

Yes
REPAIR the circuits. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
CONNECT all modules. CONNECT the negative battery cable. GO to X44.