Hummer H2. Manual - part 238

 

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Hummer H2. Manual - part 238

 

 

4. Attempt to communicate with the BCM.  

Does the scan tool communicate with the BCM?

Go to Step 14

Go to Step 

15

14

1. Turn OFF the ignition.  

2. Test the class 2 serial data circuit between the splice 

pack - SP205 and the PCM for an open, a short to 
ground, or a short to voltage. Turn ON the ignition 
leaving the engine OFF when testing for a short to 
voltage. Refer to Circuit Testing and Wiring 
Repairs in Wiring Systems.  

Did you find and correct the condition?

Go to Step 36

Go to Step 

34

15

1. Turn OFF the ignition.  

2. Disconnect the BCM.  

3. Test both class 2 serial data circuits of the BCM for an 

open, a short to ground or a short to voltage. Turn ON 
the ignition leaving the engine OFF when testing for a 
short to voltage. Refer to Circuit Testing and Wiring 
Repairs in Wiring Systems.  

Did you find and correct the condition?

Go to Step 36

Go to Step 

34

16

1. Leave the jumper wire connected to the DLC terminal 

and to the BCM terminal of the splice pack - SP205.  

2. Connect another jumper wire from the jumper wire 

connected to the DLC terminal of the splice pack - 
SP205.  

3. Connect the other end of the jumper wire, using 

correct terminal adapter, to the splice pack - SP207 
terminal of the splice pack - SP205.  

4. Turn ON the ignition leaving the engine OFF.  

5. Attempt to communicate with the BCM.  

Does the scan tool communicate with the BCM?

Go to Step 21

Go to Step 

17

17

1. Disconnect the splice pack - SP207.  

2. Inspect for poor connections at the splice pack - 

SP207. Refer to Testing for Intermittent Conditions 
and Poor Connections and Connector Repairs in 
Wiring Systems.  

3. Attempt to communicate with the BCM.  

Does the scan tool communicate with the BCM?

Go to Step 19

Go to Step 

18

Repair the class 2 serial data circuit for a short to ground or 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Data Link Communications - Hummer H2

  

18

a short to voltage between the splice pack - SP205 and the 
splice pack - SP207. Turn ON the ignition leaving the 
engine OFF when testing for a short to voltage. Refer to 
Circuit Testing and Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 36

-

19

Repeat the following steps on the class 2 serial data circuits 
connected to the splice pack - SP207 until the concern is 
located: 

1. Connect another jumper wire to the splice pack - 

SP205 terminal of the splice pack - SP207.  

2. Connect the other end of the jumper wire, using 

correct terminal adapter, to the terminal for the 
devices connected to splice pack - SP207.  

3. Turn ON the ignition leaving the engine OFF.  

4. Attempt to communicate with the BCM.  

 
Does the scan tool communicate with the BCM?

Go to Step 36

Go to Step 

20

20

1. Turn OFF the ignition.  

2. Disconnect the module that caused the no 

communication condition.  

3. Test the class 2 serial data circuit between the splice 

pack - SP207 and the respective module for a short to 
ground or a short to voltage. Turn ON the ignition 
leaving the engine OFF when testing for a short to 
voltage. Refer to Circuit Testing and Wiring 
Repairs in Wiring Systems.  

Did you find and correct the condition?

Go to Step 36

Go to Step 

34

21

1. Disconnect the jumper wire from the splice pack - 

SP207 terminal of the splice pack - SP205.  

2. Connect the jumper wire to the splice pack - SP206 

terminal of the splice pack - SP205.  

3. Turn ON the ignition leaving the engine OFF.  

4. Attempt to communicate with the BCM.  

Does the scan tool communicate with the BCM?

Go to Step 28

Go to Step 

22

22

1. Turn OFF the ignition.  

2. Disconnect the radio.  

3. Turn ON the ignition leaving the engine OFF.  

4. Attempt to communicate with the BCM.  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Data Link Communications - Hummer H2

  

Does the scan tool communicate with the BCM?

Go to Step 34

Go to Step 

23

23

Test the class 2 serial data circuit between the splice pack - 
SP205 and the radio for a short to ground or a short to 
voltage. Turn ON the ignition leaving the engine OFF when 
testing for a short to voltage. Refer to Circuit Testing and 
Wiring Repairs in Wiring Systems. 
Did you find the condition?

Go to Step 36

Go to Step 

24

24

1. Disconnect the splice pack - SP206.  

2. Inspect for poor connections at the splice pack - 

SP206. Refer to Testing for Intermittent Conditions 
and Poor Connections and Connector Repairs in 
Wiring Systems.  

3. Attempt to communicate with the BCM.  

Does the scan tool communicate with the BCM?

Go to Step 26

Go to Step 

25

25

Repair the class 2 serial data circuit for a short to ground or 
a short to voltage between the splice pack - SP205 and the 
splice pack - SP206. Turn ON the ignition leaving the 
engine OFF when testing for a short to voltage. Refer to 
Circuit Testing and Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 36

-

26

Repeat the following steps on the class 2 serial data circuits 
connected to the splice pack - SP206 until the concern is 
located: 

1. Connect another jumper wire to the splice pack - 

SP205 terminal of the splice pack - SP206.  

2. Connect the other end of the jumper wire, using 

correct terminal adapter, to the terminal for the 
devices connected to splice pack - SP206.  

3. Turn ON the ignition leaving the engine OFF.  

4. Attempt to communicate with the BCM.  

 
Does the scan tool communicate with the BCM?

Go to Step 36

Go to Step 

27

27

1. Turn OFF the ignition.  

2. Disconnect the module that caused the no 

communication condition.  

3. Test the class 2 serial data circuit between the splice 

pack - SP205 and the respective module for a short to 
ground or a short to voltage. Turn ON the ignition 
leaving the engine OFF when testing for a short to 
voltage. Refer to Circuit Testing and Wiring 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Data Link Communications - Hummer H2

  

Repairs in Wiring Systems.  

Did you find and correct the condition?

Go to Step 36

Go to Step 

34

28

1. Disconnect the jumper wire from the splice pack - 

SP206 terminal of the splice pack - SP205.  

2. Connect the jumper wire to the EBCM terminal of the 

splice pack - SP205.  

3. Turn ON the ignition leaving the engine OFF.  

4. Attempt to communicate with the BCM.  

Does the scan tool communicate with the BCM?

Go to Step 32

Go to Step 

29

29

1. Turn OFF the ignition.  

2. Disconnect the EBCM.  

3. Turn ON the ignition leaving the engine OFF.  

4. Attempt to communicate with the BCM.  

Does the scan tool communicate with the BCM?

Go to Step 34

Go to Step 

30

30

1. Turn OFF the ignition.  

2. Disconnect the TCSCM.  

3. Turn ON the ignition leaving the engine OFF.  

4. Attempt to communicate with the BCM.  

Does the scan tool communicate with the BCM?

Go to Step 34

Go to Step 

31

31

Repair the class 2 serial data circuit between the splice pack 
- SP205 and either the EBCM or TCSCM for a short to 
ground or a short to voltage. Turn ON the ignition leaving 
the engine OFF when testing for a short to voltage. Refer to 
Circuit Testing and Wiring Repairs in Wiring Systems. 
Did you complete the repair?

Go to Step 36

-

32

Repeat the following steps on the class 2 serial data circuits 
connected to the splice pack - SP205 until the concern is 
located: 

1. Disconnect the jumper wire from the EBCM terminal 

of the splice pack - SP205.  

2. Connect the jumper wire, using correct terminal 

adapter, to the terminal for the rest of devices 
connected to splice pack - SP205.  

3. Turn ON the ignition leaving the engine OFF.  

4. Attempt to communicate with the BCM.  

 

Go to Step 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Data Link Communications - Hummer H2

  

 

 

 

 

 

 

 

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