System Input
- System input tests should be performed if no trouble codes are stored when performing SELF-DIAGNOSTICS .
- System input tests cycle each cruise control switch and sensor. Use analog voltmeter or Scan Tool (MB991341) for system input check. Use scan tool according to operating instructions provided with tool. Connect leads of analog voltmeter between cruise control terminal and ground terminal of data link connector. SeeFigure .
- Turn ignition on. Check items No. 1-3 on input code chart. SeeFig 3 . Start engine. Check items No. 4 and 5 on input code chart. To display results of input check, turn main cruise control switch to OFF position.
- Activate SET switch and turn main switch to ON position. Within one second, turn RESUME switch to ON position. Activate SET switch while activating RESUME switch.NOTE: Cruise control system cannot be set during input test.
- Perform each input operation according to INPUT CODE CHART and read codes. SeeFig 3 . Each code will be displayed in order of priority starting with No. 1. If no display is present, a malfunction may exist in cruise control unit power supply circuit or SET and/or RESUME switch. Check for malfunction according to circuit tests No. 1, 2 and 3.