Hummer H1 Service Manual page 278

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Step
1 1. Install scan tool.
2. Turn ignition switch "on."
NOTE: Important: Before clearing DTC(s), use the
scan tool to record "Failure Records" for reference, as
data will be lost when the "Clear Info" function is used.
3. Record the DTC "Failure Records."
4. Select "Brake Switch" on the scan tool.
5. Disconnect the brake switch connector from he
brake switch.
Did the brake switch status change from "Closed" to
"Open?"
2 Replace brake switch.
3 Check switch wires circuit for short to B+.
Was a problem found?
4
Replace the PCM.
Is the replacement complete?
5 1. After the repair is complete, use the scan tool to
select DTC," then "Clear Info" function.
2. Select "Specific DTC" and enter DTC "P0724."
3. Ensure the following conditions are met:
• Select "Brake Switch" on scan tool, depress
brake pedal. Switch state should change as pedal
is depressed.
05745159
DTC P0724 Brake Switch Circuit High Input
Action
Transmission/Transfer Case
Value
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Go to Step 2
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Go to Step 5
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Go to Step 5
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Go to Step 5
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5-79
Yes No
Go to Step 3
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Go to Step 4
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