Diagnostic Procedure

WARNING: This page is about a different car, the 2018 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

PARKING SENSOR SYSTEM DOES NOT OPERATE DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY ALL SYSTEM DTCs Switch the ignition off. Switch the ignition ON (engine off or on) and wait for 10 s or more. Perform a CMDTC self-test using the M-MDS. (See DTC INSPECTION [PARKING ASSIST UNIT] .) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PARKING ASSIST UNIT] .)
1		No	Go to the next step.
2	DETERMINE IF CAUSE OF MALFUNCTION IS TRAILER SWITCH (OPTION) SWITCH RELATED CIRCUIT Display the parking assist unit PID PRHB_TRAIL item using the M-MDS. (See PID/DATA MONITOR INSPECTION [PARKING ASSIST UNIT] .) Is the PID PRHB_TRAIL monitoring value "Yes"?	Yes	Go to the next step.
2		No	Go to Step 5.
3	VERIFY TRAILER SWITCH (OPTION) INSTALLATION CONDITION Ask the customer if the trailer switch (option) is installed. Is the trailer switch (option) installed?	Yes	Go to the next step.
3		No	There is a short circuit to ground in the parking assist unit terminal R-related circuit. Repair or replace the wiring harness which has a short to ground.
4	VERIFY IF TRAILER SWITCH (OPTION) IS TURNED ON Verify the trailer switch (option) on/off condition. Is the trailer switch (option) turned on?	Yes	System is normal. (Explain to the customer that the parking assist system is inhibited because the trailer switch (option) is turned on.)
4		No	There is a short circuit to ground in the circuit between parking assist unit terminal R and the trailer switch (option). Repair or replace the wiring harness which has a short to ground.
5	VERIFY MALFUNCTION SYMPTOM Switch the ignition ON (engine off or on). Shift the selector lever to R position. Does the parking sensor buzzer activated?	Yes	System is normal.
5		No	Go to the next step.
6	INSPECT CLUSTER SWITCH CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Disconnect the cluster switch connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
6		No	Repair or replace the connector.
7	INSPECT PARKING ASSIST UNIT CONNECTOR CONDITION Disconnect the parking assist unit connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
7		No	Repair or replace the connector.
8	INSPECT PARKING SENSOR SWITCH CIRCUIT FOR SHORT TO GROUND Verify that the cluster switch and parking assist unit connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Cluster switch terminal A Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Cluster switch terminal A-Parking assist unit terminal V If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground.
8		No	Go to the next step.
9	INSPECT PARKING SENSOR SWITCH Inspect the parking sensor switch. (See PARKING SENSOR SWITCH INSPECTION .) Is the parking sensor switch normal?	Yes	Replace the parking assist unit. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION .)
9		No	Replace the cluster switch. (See CLUSTER SWITCH REMOVAL/INSTALLATION .)