Clearing Diagnostic Trouble Codes

After all Electronic Control Module (ECM) and Body Control Module (BCM) codes are displayed and appropriate measures are taken to correct malfunctions, trouble codes may be cleared.

Selection of the clearing codes test type will result in the message ``CODES CLEAR'' being displayed along with the selected system name.

This message will appear for 3 seconds to indicate that all stored trouble codes have been erased from that system's memory. After 3 seconds the display will automatically return to the next available test type for the selected system.


TO CLEAR ECM CODES, PROCEED AS FOLLOWS:
a. With ECM displayed on CCP (Climate Control Panel), depress the Hi button on the panel. This will permit access to ECM options (ECM data, inputs, outputs, code clearing, etc.)
b. With ECM data displayed, continue to depress the Lo button on Climate Control Panel (CCP) until "ECM Clear Codes" are displayed.
c. Depress Hi button on CCP. A ``Codes Clear'' message will be displayed on panel. This message will appear for approximately 3 seconds to indicate that all trouble codes have been erased from system memory. After clearing codes, turn the ignition off for 10 seconds before re-entering the diagnostic mode.

TO CLEAR BCM CODES:
a. With ECM displayed on CCP (Climate Control Panel), depress the Lo button on the panel. This will permit bypassing of the ECM options and lead the technician to a BCM message.
b. With BCM displayed on CCP (Climate Control Panel), depress the Hi button on the panel. This will permit access to BCM options.
c. Depress the Lo button on CCP until ``BCM Clear Codes'' is displayed.
d. Depress Hi button on CCP. A ``Codes Clear'' message will be displayed on panel. This message will appear for approximately 3 seconds to indicate that all trouble codes have been erased from system memory. After clearing codes, turn the ignition off for 10 seconds before re-entering the diagnostic mode.