DTC B1488
Circuit Description
The generator battery control module controls the generator through the generator turn on signal
circuit. The signal is a 5-volt pulse width modulation (PWM) signal of 128 Hz with a duty cycle
of 0-100 percent. Normal duty cycle is between 5-95 percent. If the generator turn on signal
circuit is 65 percent or greater duty cycle or pulled high to battery positive voltage, 5 volts, then
DTC B1488 will set.
DTC Descriptor
Is the DMM reading equal to the
specified value?
Go to Step 4 Go to Step 3
3
Inspect for poor connections at the
harness connector of the generator
battery control module. Refer to
Testing for Intermittent
Conditions and Poor Connections
and Connector Repairs .
Did you find and correct the
condition?
-
Go to Step 6 Go to Step 5
4
Repair the short to ground of the
generator turn on signal circuit.
Did you find and correct the
condition?
-
Go to Step 6 Go to Step 5
5
Replace the generator battery control
module. Refer to Control Module
References for replacement, setup
and programming.
Did you complete the replacement?
-
Go to Step 6
-
6
1. Use the scan tool in order to
clear the DTC.
2. Operate the vehicle within the
Conditions for Running the
DTC, as specified in the
supporting text.
Does the DTC reset?
-
Go to Step 2 System OK
2007 Hummer H3
2007 ENGINE Engine Electrical - H3