No ISAT Communication

No Communication Between The ACC Control Module And The ISAT
1. Check whether communication can be established between the main instrument display panel and the SID. If not, proceed to point 3.
2. Connect a BOB to the ACC control module and check the voltage across BUS+ (pin 11) and ground. Also check the voltage across BUS- (pin 13) and ground. In both cases a reading of about 2.5 V should be obtained. If not, proceed to point 4.
3. Check the data link connector for loose or displaced pins. Check the voltage across BUS+ (pin 1) and ground and across BUS- (pin 9) and ground. In both cases a reading of about 2.5 V should be obtained. If not, check the wiring for continuity and shorting. Locate and rectify the break or short circuit.
4. Check the ACC control module and wiring harness side for loose or displaced pins. Proceed to "Before Changing A Control Module" for further measures if the ACC panel does not go out when the Black Panel button is pressed. Testing and Inspection