1) Turn ON the ignition switch.
2) Observe the DTC information for the brake control system with a scan tool. Is a wheel speed sensor DTC set?
3) Observe the DTC information for the engine control system with a scan tool. Is a vehicle speed-related DTC set?
Yes
Go to the applicable DTC diagnosis.
No
=>Go to Inspection for open circuit and short circuit in vehicle speed signal circuit.
1) Inspect the vehicle speed signal circuit between the wireless access module (pin 13 of B14) and the EHCU (pin 2 of C13) for the following. Is the result normal?
Refer to "LHD Power Door Locks (Wireless Access Module (Hi-version))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Power Door Locks (Wireless Access Module (Hi-version))" in the ETM (wiring diagram). (Open using the ETM viewer.).
2) Inspect the vehicle speed signal circuit between the wireless access module (pin 13 of B14) and the ECM (4JJ3 engine models: pin 22 of C8; RZ4E engine models: pin 19 of C7) for the following. Is the result normal?
Refer to "LHD Power Door Locks (Wireless Access Module (Hi-version))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Power Door Locks (Wireless Access Module (Hi-version))" in the ETM (wiring diagram). (Open using the ETM viewer.).
3) Are all of the results normal?
Yes
=>Go to Wireless access module harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect for poor connections at the wireless access module harness connector (pin 13 of B14). Is the connection status normal?
Refer to "LHD Power Door Locks (Wireless Access Module (Hi-version))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Power Door Locks (Wireless Access Module (Hi-version))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Wireless access module replacement.
No
Repair the connections as necessary.
Note
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control wireless access module removal".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control wireless access module installation".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch.
3) Start the engine.
4) Observe the DTC information with a scan tool.