Hummer H1 Service Manual page 1185

120 PCM/Tech 1 Scan Tool
Test Description
Number(s) below refer to the step number(s) on the Diagnostic
Table.
2. Be sure that both the ON and OFF states are commanded.
Repeat the commands as many times as necessary.
3. This check can detect a partially shorted coil which would
cause excessive current flow. Leaving the circuit energized
for 2 minutes allows the coil to warm up. When warm, the
coil may open (Amps drop to zero), or short (Amp draw
greater than 0.75A).
14.If no trouble is found in the control circuit or the connection
at the PCM, the PCM may be malfunctioning. However, this
is an extremely unlikely failure.
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