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