2010 Cadillac Truck SRX FWD V6-3.0L Page 2164
5. Repeat step 3 until one of the follow conditions are isolated:
* A short to voltage on the serial data circuit between 2 control modules
* A short to voltage on the serial data circuit between a control module and a terminating resistor
Testing the Serial Data Circuits for a Short to Ground
1. Ignition OFF, disconnect the harness connectors with the mid speed or chassis high speed serial data circuits at an easily accessible control
module.
2. Ignition OFF for 60 seconds, test for less than 100 ohm between the serial data circuits and ground. Verify that one or more serial data
circuits are less than 100 ohm.
瀚慖f greater than the specified range for all serial data circuits, replace the control module that was disconnected.
3. Disconnect the harness connectors with the mid speed or chassis high speed serial data circuits at another control module, in the direction of
the circuit shorted to ground.
4. Ignition OFF for 60 seconds, test for less than 100 ohm between the serial data circuits and ground. Verify that one or more serial data
circuits are less than 100 ohm.
瀚慖f greater than the specified range for all serial data circuits, replace the control module that was just disconnected.
5. Repeat step 3 until one of the follow conditions are isolated:
* A short to ground on the serial data circuit between 2 control modules
* A short to ground on the serial data circuit between a control module and a terminating resistor
Testing the Serial Data Circuits for a Short between the Circuits
1. Ignition OFF, disconnect the harness connectors with the mid speed or chassis high speed serial data circuits at an easily accessible control
module, that is not communicating.
2. Ignition OFF for 60 seconds, test for less than 110 ohm between each pair of serial data circuits. Verify that one pair of serial data circuits are
less than 110 ohm.
瀚慖f greater than the specified range for each pair of serial data circuits, replace the control module that was disconnected.
3. Connect the harness connectors at the control module that was disconnected.
4. Disconnect the harness connectors with the mid speed or chassis high speed serial data circuits at another control module, in the direction of
the circuits shorted together.
5. Ignition OFF for 60 seconds, test for less than 110 ohm between each pair of serial data circuits. Verify that one pair of serial data circuits are
less than 110 ohm.
瀚慖f between the specified range for each pair of serial data circuits, replace the control module that was just disconnected.
6. Repeat step 3 until one of the following conditions are isolated:
* Serial data circuits shorted together between 2 control modules
* Serial data circuits shorted together between a control module and a terminating resistor
* A shorted terminating resistor
Testing the Serial Data Circuits for a Open/High Resistance
1. Ignition OFF, disconnect the harness connectors with the mid speed or chassis high speed serial data circuits at an easily accessible control
module, that is not communicating.
2. Ignition OFF for 60 seconds, test for greater than 130 ohm between each pair of serial data circuits. Verify that one pair of serial data circuits
are greater than 130 ohm.
瀚慖f less than the specified range for each pair of serial data circuits, replace the control module that was disconnected.
3. Connect the harness connectors at the control module that was disconnected.
4. Disconnect the harness connectors with the mid speed or chassis high speed serial data circuits at another control module, in the direction of
the open circuit.
5. Ignition OFF for 60 seconds, test for greater than 130 ohm between each pair of serial data circuits. Verify that one pair of serial data circuits
are greater than 130 ohm.
6. Repeat step 3 until one of the following conditions are isolated:
* An open/high resistance on the serial data circuit between 2 control modules
* An open/high resistance on the serial data circuit between a control module and a terminating resistor
* An open/high resistance terminating resistor
Testing the Ignition Circuit
1. Ignition OFF, disconnect the harness connectors with the ignition circuits at an easily accessible control module that is not communicating.
2. Ignition OFF, verify that a test lamp does not illuminate between each ignition circuit terminal and ground, at the control module connector
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