Cruise Control Systems: Testing: Self-Diagnostics
- Self-diagnostics should be performed when cruise control cancels without driver using normal cancel modes. Data Link Connector (DLC) is located on right side of fuse box.
- Use Scan Tester (MB991341) or an analog voltmeter for code retrieval. Plug scan tester connectors into cigarette lighter and DLC. Read trouble codes. If using voltmeter, connect leads of analog voltmeter between cruise control terminal and ground terminal of DLC. See Fig 1
. Read voltmeter needle sweeps to determine trouble code.NOTE: Codes No. 15 and 16 will be displayed whether malfunction is present or not.
- Once trouble codes have been displayed, refer to SELF-DIAGNOSTIC TROUBLE CODES to find appropriate CIRCUIT TEST. Refer to CIRCUIT TESTS . To clear trouble codes, disconnect positive battery cable or go to next step.
- Turn ignition on. Turn cruise control set switch on. Turn cruise switch on and, in less than one second after cruise switch is turned on, turn resume switch on.
- Press set switch and brake pedal simultaneously, holding them for more than 5 seconds. Ensure codes are cleared.