Lost communication with the Wireless Access Module (Hi-version[Passive Entry and Start System]) (models without radar sensor and stereo camera) (Wireless Access Module (Hi-version [Passive Entry and Start System]))

1. Scan tool power-up check

1) Connect the scan tool.

2) Power up the scan tool. Does the scan tool power up?

Yes

=>Go to DLC inspection.

Go to Scan tool does not power up.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Scan tool does not power up".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) Scan tool does not power up".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Scan tool does not power up".

2. DLC inspection

1) Inspect for poor connections at the DLC (pins 6 and 14 of C19). Is the connection status normal?

Refer to "LHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to Wireless access module harness connector inspection.

Repair the connections as necessary.

=>Go to Repair verification.

3. Wireless access module harness connector inspection

1) Inspect for poor connections at the wireless access module harness connector (pins 19 and 20 of B15). 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 Fuse inspection.

Repair the connections as necessary.

=>Go to Repair verification.

4. Fuse inspection

1) Inspect the WAM (+B) 5A fuse. Is the result normal?

Yes

=>Go to Inspection for open circuit in battery power supply circuit.

Replace the fuse as necessary. If the fuse blows out again, repair the short to ground in the circuits relating to the fuse.

=>Go to Repair verification.

5. Inspection for open circuit in battery power supply circuit

1) Turn OFF the ignition switch.

2) Disconnect the wireless access module harness connector (B14).

3) Connect a test lamp between the battery power supply circuit of the wireless access module harness connector (pin 1 of B14) and the body ground. Does the test lamp illuminate?

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 Ground circuit check.

Repair the open circuit or high resistance in the battery power supply circuit between the WAM(+B) 5A fuse and the wireless access module (pin 1 of B14).

=>Go to Repair verification.

6. Ground circuit check

1) Connect a test lamp between the battery power supply circuit and the ground circuit of the wireless access module harness connector (pins 1 and 32 of B14). Does the test lamp illuminate?

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 Inspection for open circuit and short circuit in CAN communication circuit.

=>Go to Inspection for open circuit in ground circuit.

7. Inspection for open circuit in ground circuit

1) Inspect the ground circuit between the wireless access module (pin 32 of B14) and the body ground for an open circuit or high resistance. 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.).

Yes

Repair corrosion and tightening of the wireless access module ground terminals.

=>Go to Repair verification.

Repair the circuit as necessary.

=>Go to Repair verification.

8. Inspection for open circuit and short circuit in CAN communication circuit

1) Inspect the CAN Low circuit and CAN High circuit between the wireless access module (pins 19 and 20 of B15) and the DLC (pins 6 and 14 of C19) for the following. Is the result normal?

Open circuit
High resistance
Short together between CAN communication circuits

Refer to "LHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to Wireless access module replacement.

Repair the circuit as necessary.

=>Go to Repair verification.

9. Wireless access module replacement

Note

After replacing the wireless access module, programming must be performed.

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".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control wireless access module setting (with passive entry and start system)".

Procedure completion

=>Go to Repair verification.

10. Repair verification

1) Connect all of the removed fuses and harness connectors.

2) Turn OFF the ignition switch.

3) Any of the following is operated.

Press the engine start/stop button.
Press the request switch of the outside handle.
Open and close a door.

4) Verify that communication can be established with the wireless access module using the scan tool. Can communication with the wireless access module be established?

Yes

The system is normal.

=>Go to DLC inspection.