Code 57 - Cruise Control Output Monitoring: Notes

Cruise control output monitoring circuit is used to determine the state of circuit No. 1679. When cruise control is engaged (the brake pedal is not depressed and ASR is not operating) cruise control cutoff relay completes engagement circuit through terminals "A" (Black wire) and "C" (Gray wire). When EBCM supplies battery voltage to circuit No. 1679 (activating cruise control cutoff relay) cruise control circuit is opened by relay switch moving off relay terminal "A" (Black wire).

If circuit No. 1679 remains high when relay coil is energized (which should pull circuit low), the SERVICE ASR indicator light will illuminate and Code 57 will be set.

1. Measures resistance in relay coil.
2. Checks for open in ground circuit No. 150.
3. Checks for open in circuit No. 1679.
4. Checks for short to battery voltage in circuit No. 1679.
5. Checks for EBCM-switched short to battery voltage.
6. Checks for reset of Code 57. If Code 57 is reset after ensuring circuit No. 1679 is okay, EBCM is detecting a problem in circuit No. 1679 when one does not exist.
7. Checks for correct system operation after replacing cruise control cutoff relay.
8. Checks for any remaining code-setting problems after replacing cruise control cutoff relay in step 7).