DTC B170B[0A] External Buzzer Output Circuit Failure (Wireless Access Module (Hi-version [Passive Entry and Start System]))

1. Wireless access module system check

Refer to "71.Security and Locks Control 10S.Troubleshooting(Wireless Access Module (Hi-version [Passive Entry and Start System])) Diagnostic system check-Wireless Access Module (Hi-version[Passive Entry and Start System])".

2. External buzzer control voltage check

1) Turn OFF the ignition switch.

2) Disconnect the external buzzer harness connector (C38).

3) Connect a test lamp between the control circuit of the external buzzer harness connector (pin 1 of C38) and the body ground.

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.).

4) Turn ON the ignition switch. Does the test lamp illuminate?

Yes

=>Go to Inspection for short to power supply in external buzzer control circuit.

No

=>Go to External buzzer control voltage check using a scan tool.

3. External buzzer control voltage check using a scan tool

1) Leave the test lamp connected.

2) Perform Outer Buzzer with a scan tool.

3) While commanding the external buzzer ON and OFF with a scan tool, check the test lamp operation. Does the test lamp illuminate when commanded ON and turn OFF when commanded OFF?

Yes

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

No

=>Go to Inspection for open circuit and short circuit in control circuit.

4. Inspection for short to power supply in external buzzer control circuit

1) Inspect the control circuit between the wireless access module (pin 15 of B15) and the external buzzer (pin 1 of C38) for a short to the battery power supply circuit or a short to the ignition power supply circuit. 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

=>Go to Wireless access module replacement.

No

Repair the circuit as necessary.

=>Go to Repair verification.

5. Inspection for open circuit and short circuit in control circuit

1) Inspect the control circuit between the wireless access module (pin 15 of B15) and the external buzzer (pin 1 of C38) 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.).

Yes

=>Go to Wireless access module harness connector inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

6. Inspection for open circuit in external buzzer ground circuit

1) Inspect the ground circuit between the external buzzer (pin 2 of C38) 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

=>Go to External buzzer harness connector inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

7. External buzzer harness connector inspection

1) Inspect for poor connections at the external buzzer harness connector (pins 1 and 2 of C38). 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

Replace the external buzzer.

Refer to "9.Body, Cab, Accessories 9J.Security and Locks External buzzer removal".

Refer to "9.Body, Cab, Accessories 9J.Security and Locks External buzzer installation".

=>Go to Repair verification.

No

Repair the connections as necessary.

=>Go to Repair verification.

8. Wireless access module harness connector inspection

1) Inspect for poor connections at the wireless access module harness connector (pin 15 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 Wireless access module replacement.

No

Repair the connections as necessary.

=>Go to Repair verification.

9. Wireless access module replacement

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 disconnected harness connectors.

2) Clear the DTC with a scan tool.

3) Turn OFF the ignition switch.

4) Perform Outer Buzzer with a scan tool.

5) While commanding the external buzzer ON and OFF with a scan tool, check the external buzzer operation. Does the external buzzer operate when commanded ON and stop when commanded OFF?

Yes

Observe the DTC information with a scan tool.

No

=>Go to External buzzer control voltage check.