B660

Code B660 - Cruise Control - Transmission Gear Selector Switch Circuit:

Wiring Diagram for Code B660 - Cruise Control - Transmission Gear Selector Switch Circuit:

CODE B660 - CRUISE CONTROL - TRANS. GEAR SELECTOR SWITCH CIRCUIT

Circuit Description:

The BCM which issues the control signals to the servo, checks to make sure the vehicle is in a forward gear before allowing cruise control operation. This is done by the BCM receiving the ECM's inputs for park and neutral over the data line and by CKT 24 feeding directly to the BCM for reverse gear status (HI on CKT 24 indicates reverse).

Code B660 will set if the cruise control is engaged and the BCM receives a signal indicating that the vehicle is in park, neutral, or reverse. During the time the failure is present the BCM will disengage the cruise control.


Test Description:

1. BCM input BI24 displays reverse gear status, as HI or LO depending on the voltage state at the BCM. The display should read HI only when the transaxle is in reverse gear. If it reads HI in any other gear selection the switch must be misadjusted, or CKT 24 (including the switch) is shorted to voltage.

2. ECM input E174 displays P/N gear status, as HI or LO depending on the voltage state at the ECM. The display should read LO only when the transaxle is in park or neutral. If it reads LO in any other gear selection the switch must be misadjusted, or CKT 434 (including the switch) is shorted to ground.

3. Checks to see if the short to ground reading is due to the switch or the circuit.


Note on Intermittents:

Since this code was designed to prevent cruise control operation when the vehicle is not in a forward gear, this code can be set if the operator selects neutral, reverse, or park when the cruise control is engaged. This will cause the cruise to drop out until the operator re-engages the cruise. If the operator describes this condition but did not move the gear selector out of the forward gears, check the gear selector switch for adjustment, and CKT 24 for intermittent shorts to voltage, and CKT 434 for intermittent short to ground.