Diagnostic Procedure

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK INPUT VOLTAGE FOR ELECTRONIC PARKING BRAKE CM. Turn the ignition switch to OFF. Disconnect the connectors from the electronic parking brake CM. Turn the ignition switch to ON. Measure the voltage between electronic parking brake CM connector and chassis ground. Connector & terminal (R355) No. 18 (+) - Chassis ground (-): (R355) No. 17 (+) - Chassis ground (-):	Is the voltage 10 - 15 V?	Go to step 2 .	Repair the power supply circuit.
2 CHECK GROUND CIRCUIT OF ELECTRONIC PARKING BRAKE CM. Turn the ignition switch to OFF. Measure the resistance between electronic parking brake CM connector and chassis ground. Connector & terminal (R355) No. 6 - Chassis ground:	Is the resistance less than 10 Ω?	Go to step 3 .	Repair the defective ground circuit of the electronic parking brake CM.
3 CHECK CAUSE OF SIGNAL NOISE. Make sure the radio wave devices and electronic components are installed correctly.	Are the radio wave devices and electronic components installed correctly?	Go to step 4 .	Install the radio wave devices and electronic components properly.
4 CHECK CAUSE OF SIGNAL NOISE. Check if the noise sources (such as an antenna) are installed near the electronic parking brake CM harness.	Are noise sources installed?	Install the noise sources apart from the electronic parking brake CM harness.	Go to step 5 .
5 CHECK POOR CONTACT OF CONNECTORS.	Is there poor contact of power supply circuit, ground circuit and electronic parking brake CM connector?	Repair the connector.	Go to step 6 .
6 CHECK ELECTRONIC PARKING BRAKE CM. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.	Is the same DTC displayed?	Replace the electronic parking brake CM. < Refer to PARKING BRAKE ACTUATOR . >	Go to step 7 .
7 CHECK OTHER DTC DETECTION.	Is any other DTC displayed?	Perform the diagnosis according to DTC.	It results from a temporary poor contact interference.