HandsFreeLink System Symptom Troubleshooting - HFL does not respond(With Normal Audio)

NOTE: Check the vehicle 12 volt battery condition first .

1. Problem verification 1:
- 1. Turn the vehicle to the ON mode.

- 2. Press the PHONE button, and check if the multi-information display unit changes to the HFL information screen.

Is the HFL information displayed?

YES

Go to step 2.

NO: With short message service

The failure is duplicated, go to step 3.

NO: Without short message service

Go to step 11.
2. Problem verification 2:
- 1. Do the HFL Self-Diagnostic Function .

Is HFL prompt played?

YES: "The HFT is OK." is played

Intermittent failure, the system is OK at this time. If possible, have the customer demonstrate the issue.

YES: "The HFT is NG." is played

Check for HFL DTCs .

NO

Go to The HFL prompts and incoming call cannot be heard or are weak (HFL information display is normal) (without navigation) troubleshooting - Refer to: HandsFreeLink System Symptom Troubleshooting - HFL does not respond(With Normal Audio) HandsFreeLink System Symptom Troubleshooting - Bluetooth audio does not work(With Normal Audio) HandsFreeLink System Symptom Troubleshooting - Bluetooth cell phone cannot be paired(With Normal Audio) HandsFreeLink System Symptom Troubleshooting - The HFL prompts or incoming call cannot be heard or are weak (HFL information display is normal) (With Normal Audio) HandsFreeLink System Symptom Troubleshooting - No sound when Bluetooth audio is used(With Normal Audio) HandsFreeLink System Symptom Troubleshooting - HFL does not respond(With Navigation, With Display Audio) HandsFreeLink System Symptom Troubleshooting - HFL does not respond(Without Navigation, With Display Audio) .

3. Determine possible failure area (GA +B line, others):

- 1. Turn the vehicle to the OFF (LOCK) mode.

- 2. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF mode
Test point 1	HandsFreeLink control unit 32P connector No. 32
Test point 2	Body ground

Is there battery voltage?

YES

The GA +B wire is OK. Go to step 6.

Go to step 4.

4. Open wire check (GA +B line):

- 1. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test point 1	Audio unit connector C (14P) No. 6 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Body ground

Is there battery voltage?

YES

Repair an open in the wire between the audio unit and the HandsFreeLink control unit.

The GA +B wire is not open. Go to step 5.

5. Shorted wire check (GA +B line):

- 1. Disconnect the following connectors.

Audio unit connector C (14P)

HandsFreeLink control unit 32P connector

- 2. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	HandsFreeLink control unit 32P connector: disconnected
	Audio unit connector C (14P): disconnected

Test point 1	HandsFreeLink control unit 32P connector No. 32
Test point 2	Body ground

Is there continuity?

YES

Repair a short to body ground in the wire between the audio unit and the HandsFreeLink control unit.

Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .

6. Determine possible failure area (GA GND line, others):

- 1. Turn the vehicle to the ON mode.

- 2. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	HandsFreeLink control unit 32P connector No. 16
Test point 2	Body ground

Is there less than 0.2 V?

YES

The GA GND wire is OK. Go to step 8.

Go to step 7.

7. Open wire check (GA GND line):

- 1. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Audio unit connector C (14P) No. 10 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Body ground

Is there any voltage?

YES

Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .

Repair an open or high resistance in the wire between the audio unit and the HandsFreeLink control unit.

8. Determine possible failure area (GA SYS ON line, others):

- 1. Turn the vehicle to the OFF (LOCK) mode.

- 2. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test point 1	HandsFreeLink control unit 32P connector No. 24
Test point 2	Body ground

Is there battery voltage?

YES

The GA SYS ON wire is OK. Go to step 10.

Go to step 9.

9. Open wire check (GA SYS ON line):

- 1. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test point 1	Audio unit connector C (14P) No. 5 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Body ground

Is there battery voltage?

YES

Repair an open in the wire between the audio unit and the HandsFreeLink control unit.

Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .

10. Audio unit check:

- 1. Turn the vehicle to the ON mode.

- 2. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	HandsFreeLink control unit 32P connector No. 24
Test point 2	Body ground

Is there less than 0.2 V?

YES

Go to step 14.

Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .

11. Fuse check:

- 1. Turn the vehicle to the OFF (LOCK) mode.

- 2. Check the following fuse.

Fuse	No. B19 (7.5 A)
Location	Under-dash fuse/relay box

Fuse	No. B25 (10 A)
Location	Under-dash fuse/relay box

Is the fuse OK?

YES

Go to step 12.

Replace the fuse(s), and recheck. If the fuse(s) blows again, check for a short in the No. B19 (7.5 A) fuse and/or the No. B25 (10 A) fuse circuit(s).

12. Open wire check (+B AUDIO line, ACC line):

- 1. Turn the vehicle to the ON mode.

- 2. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	HandsFreeLink control unit 32P connector No. 32
Test point 2	Body ground

Test point 1	HandsFreeLink control unit 32P connector No. 31
Test point 2	Body ground

Is there battery voltage?

YES

The +B AUDIO and the ACC wires are OK. Go to step 13.

Repair an open in the wire between the No. B19 (7.5 A) fuse in the under-dash fuse/relay box and/or the No. B25 (10 A) fuse in the under-dash fuse/relay box and the HandsFreeLink control unit.

13. Open wire check (GND line):

- 1. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	HandsFreeLink control unit 32P connector No. 16
Test point 2	Body ground

Is there less than 0.2 V?

YES

The GND wire is OK. Go to step 14.

Repair an open in the wire between the HandsFreeLink control unit and body ground (G503).

14. Shorted wire check (GA BUS+ line, GA BUS- line):

- 1. Disconnect the following connectors.

Audio unit connector C (14P)

HandsFreeLink control unit 32P connector

Multi-information display unit connector A (32P)

- 2. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio unit connector C (14P): disconnected
	HandsFreeLink control unit 32P connector: disconnected
	Multi-information display unit connector A (32P): disconnected
Test point 1	Audio unit connector C (14P) No. 12 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Body ground

Test point 1	Audio unit connector C (14P) No. 11 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Body ground

Is there continuity?

YES

There is a short to body ground in the GA BUS wire(s). Replace the affected shielded harness.

The GA BUS+ and the GA BUS- wires are not shorted to ground. Go to step 15.

15. Shorted wire check (GA BUS+ line to GA BUS- line):

- 1. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio unit connector C (14P): disconnected
	HandsFreeLink control unit 32P connector: disconnected
	Multi-information display unit connector A (32P): disconnected
Test point 1	Audio unit connector C (14P) No. 12 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)

Test point 2

Audio unit connector C (14P) No. 11 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)

Is there continuity?

YES

There is a short in the GA BUS wires. Replace the affected shielded harness.

The GA BUS+ and the GA BUS- wires are not shorted. Go to step 16.

16. Shorted wire check (SH GA BUS line to another lines):

- 1. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio unit connector C (14P): disconnected
	HandsFreeLink control unit 32P connector: disconnected
	Multi-information display unit connector A (32P): disconnected
Test point 1	Audio unit connector C (14P) No. 4 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Audio unit connector C (14P) No. 12 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)

Test point 1	Audio unit connector C (14P) No. 4 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Audio unit connector C (14P) No. 11 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)

Is there continuity?

YES

There is a short in the GA BUS wires. Replace the affected shielded harness.

The SH GA BUS wire is OK. Go to step 17.

17. Open wire check (GA BUS+ line, GA BUS- line):

- 1. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio unit connector C (14P): disconnected
	HandsFreeLink control unit 32P connector: disconnected
	Multi-information display unit connector A (32P): disconnected
Test point 1	Audio unit connector C (14P) No. 12 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	HandsFreeLink control unit 32P connector No. 13

Test point 1	Audio unit connector C (14P) No. 11 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	HandsFreeLink control unit 32P connector No. 12

Is there continuity?

YES

The GA BUS+ and the GA BUS- wires are OK. Go to step 18.

There is an open in the wire(s) between the audio unit and the HandsFreeLink control unit. Replace the affected shielded harness.

18. Determine possible failure area (related unit, others):
- 1. Reconnect the HandsFreeLink control unit 32P connector and audio unit connector C (14P).

- 2. Turn the vehicle to the ON mode.

- 3. Do the HFL Self-Diagnostic Function .

Do you hear, "The HFT is OK"?

YES

Replace the multi-information display unit .

NO

Go to step 19.
19. HandsFreeLink control unit check (substitution):
- 1. Turn the vehicle to the OFF (LOCK) mode.

- 2. Substitute a known-good HandsFreeLink control unit .

- 3. Reconnect all the connectors, and recheck.

Does the symptom go away?

YES

Replace the original HandsFreeLink control unit .

NO

Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .