B672

Chart:

Schematic:

The cruise control vent solenoid receives pulsed voltage signals from the Body Control Module (BCM) to control the amount of time the solenoid is energized. During the time the output is Hi the solenoid is energized and vacuum is not vented (or it is trapped) in the servo.


Code B672 will set if the cruise is on, the brake is not depressed and the BCM output is HI when it should be LO, or LO when it should be HI. Under either of these conditions, the BCM will disable the cruise control until the BCM sees the proper output signals. These determinations are made internal to the BCM and may or may not affect the HI or LO reading displayed on BCM output BOO1.

An output display of LO means CKT 403 should be de-energized (solenoid off) and an output display of Hf means CKT 403 should be energized (solenoid on).

TEST DESCRIPTION
The numbers below refer to circled numbers on the diagnostic chart:
1. BCM output BO01 cycles the vent solenoid. The HI and LO refer to the commanded state of the voltage at the BCM.
2. Checks to see if fault is due to servo or circuit.
3. Checks to see if fault is due to open ground circuit or control circuit including servo solenoid.
4. Checks to see if fault is shorted servo or control circuit.

NOTE ON INTERMITTENTS
If an intermittent Code B672 is being set, manipulate the related wiring while in the output function BOOl and listen for the solenoid to cycle. (or stop cycling). This will have to be done slowly as this function cycles the solenoid on and off every 3 seconds. Make sure the intermittent condition can be induced a few times during the on (or HI) output interval.