Page 2665 of 2893

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YES
NO YES
NO
DTC B1776:
23-37723-377
HANDSFREELINK CONTROL UNIT 28P CONNECTOR
MIC SIG (GRN)
11. Disconnect navigation unit connector D (12P).
12. Turn the ignition switch to ON (II).
13. Measure the voltage between HandsFreeLinkcontrol unit 28P connector terminal No. 27 and
body ground.
Short to power in the wire between the
HandsFreeLink control unit and the navigation unit.
Replace the affected shielded harness.
Substitute a known-good microphone
(see page 23-358), then recheck. If the symptom
goes away, replace the original HFL-navigation
microphone. 1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), then turn it to
ON (II).
3. Check for DTCs with the HDS.
Go to step 4.
Intermittent failure, the system is OK at this
time.
4. Turn the ignition switch to LOCK (0).
5. Disconnect the HandsFr eeLink control unit 28P
connector.
6. Disconnect the HFL-navigation microphone 3P connector.
(cont’d)Microphone Input/Output Short
to Ground/Open
Wire side of female terminals
Is there voltage? Is DTC B1776 indicated?
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DYNOMITE -2009-
Page 2666 of 2893

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YES
NO
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NO YES
NO
23-378HandsFreeLink System
DTC Troubleshooting (cont’d)
HANDSFREELINK CONTROL UNIT 28P CONNECTOR
MIC (YEL)MIC
(BRN)
HANDSFREELINK CONTROL UNIT 28P CONNECTOR MIC (YEL)MIC
(BRN) HANDSFREELINK CONTROL UNIT 28P CONNECTOR
MIC SIG (GRN)
7. Check for continuity between body ground andHandsFreeLink control unit 28P connector
terminals No. 13 and No. 14 individually.
Short to body ground in the wire(s) between
HandsFreeLink control unit and HFL-navigation
microphone. Replace the affected shielded
harness.
Go to step 8.
8. Check for continuity between HandsFreeLink control unit the 28P connector terminal No. 13 and
No. 14.
Short in the wire(s) between the
HandsFreeLink control unit and HFL-navigation
microphone. Replace the affected shielded
harness.
Go to step 9. 9. Disconnect navigation unit connector D (12P).
10. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 27 and
body ground.
Short to body ground in the wire(s) between
the HandsFreeLink control unit and the navigation
unit. Replace the affected shielded harness.
Substitute a known-good navigation unit
(see page 23-355), then recheck. If the symptom
goes away, replace the original navigation unit
(see page 23-355).
Wire side of female terminals
Wire side of female terminals Wire side of female terminals
Is there continuity?
Is there continuity? Is there continuity?
08/08/21 14:18:41 61SNR030_230_0381
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DYNOMITE -2009-
Page 2667 of 2893

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DTC B1779:
YES
NO
YES
NO YES
NO
23-379
HFL-VOICE CONTROL SWITCH 5P CONNECTORHFL STRG SW (ORN/WHT)
HFL STRG SW (BLU)
HANDSFREELINK CONTROL UNIT 28P CONNECTOR
HFL Switch (HFL TALK/HFL BACK
Buttons) Circuit Open/Short
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), then start the
vehicle, and turn the steering wheel back and forth
several times.
3. Check for DTCs with the HDS.
Go to step 4.
Intermittent failure, the system is OK at this
time.
4. Turn the ignition switch to LOCK (0).
5. Do the HFL switch test (see page 23-387).
Go to step 6.
Replace the HFL-voice control switch
(see page 23-357).
6. Disconnect the HandsFr eeLink control unit 28P
connector.
7. Disconnect the HFL-voice control switch 5P connector. 8. Check for continuity between HandsFreeLink
control unit 28P connector terminal No. 2 and the
HFL-voice control switch 5P connector terminal
No. 3.
Go to step 9.
Repair open in the wire between the switch,
the cable reel, and the HandsFreeLink control unit.
(cont’d)
Wire side of female terminals
Wire side of female terminals
Is DTC B1779 indicated?
Is the switch OK ? Is there continuity?
08/08/21 14:18:41 61SNR030_230_0382
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DYNOMITE -2009-
Page 2668 of 2893

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YES
NO
YES
NO
23-380HandsFreeLink System
DTC Troubleshooting (cont’d)
HANDSFREELINK CONTROL UNIT 28P CONNECTOR
HFL STRG SW (BLU)
HFL-VOICE CONTROL SWITCH 5P CONNECTORREMOTE GND (BRN)
NAVIGATION UNIT CONNECTOR A (24P)
REMOTE GND (BRN)
9. Turn the ignition switch to ON (II).
10. Measure the voltage between HandsFreeLink control unit 28P connector terminal No. 2 and body
ground.
Repair short to power in the wire between
the HandsFreeLink control unit and the HFL-voice
control switch.
Go to step 11. 11. Turn the ignition switch to LOCK (0).
12. Disconnect navigation unit connector A (24P).
13. Check for continuity between navigation unit
connector A (24P) terminal No. 5 and HFL-voice
control switch 5P connector terminal No. 4.
Replace the HandsFreeLink control unit.
Repair open in the wire between the switch,
the cable reel, and the navigation unit .
Wire side of female terminals
Wire side of female terminalsWire side of female terminals
Is there voltage?
Is there continuity?
08/08/21 14:18:41 61SNR030_230_0383
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Page 2669 of 2893

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DTC B1780:
YES
NO
YES
NO YES
NO
23-381
HANDSFREELINK CONTROL UNIT 28P CONNECTOR
HFL STRG SW (BLU)
HFL Switch (HFL TALK/HFL BACK
Buttons) Circuit Short
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), then start the
vehicle, and turn the steering wheel back and forth
several times.
3. Check for DTCs with the HDS.
Go to step 4.
Intermittent failure, the system is OK at this
time.
4. Turn the ignition switch to LOCK (0).
5. Do the HFL switch test (see page 23-387).
Go to step 6.
Replace the HFL-voice control switch
(see page 23-357).
6. Disconnect the HandsFr eeLink control unit 28P
connector.
7. Disconnect the HFL-voice control switch 5P connector. 8. Check for continuity between HandsFreeLink
control unit 28P connector terminal No. 2 and body
ground.
Repair short in the wire between the
HandsFreeLink control unit and the HFL-voice
control switch.
Replace the HandsFreeLink control unit
(see page 23-388).
Wire side of female terminals
Is DTC B1780 indicated?
Is the switch OK ? Is there continuity?
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Page 2670 of 2893

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DTC B1792: The HFL system does not recognize all voice
prompts
YES
NO YES
NO
YES
NO
YES
NO
YES
NO
23-38223-382HandsFreeLink System
DTC Troubleshooting (cont’d) Symptom Troubleshooting
HandsFreeLink Control Unit
Internal Error
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), then turn it to
ON (II).
3. Check for DTCs with the HDS.
Replace the HandsFreeLink control unit.
Intermittent failure, the system is OK at this
time. 1. Connect the HDS to the DLC.
2. Clear the DTCs with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to
ON (II).
4. Check for DTCs.
Repair the indicated DTCs.
Go to step 5.
5. Check if the problem is duplicated.
Go to step 6.
The system is OK at this time. Ask the
customer to demonstrate the problem.
6. Check if the navigation system can recognize voice prompts.
Go to step 7.
Refer to the navigation system
troubleshooting (see page 23-342).
7. Pair the client’s phone to a known-good vehicle and try to duplicate the problem.
Call the HFL support desk at 888-528-7876,
and inquire if there are any known issues for the
problem. If there are no known issues, explain to
the client’s this is a system characteristic and
cannot be improved at this time.
Substitute a known-good HFL-navigation
microphone (see page 23- 358). If the problem is
still present, substitute a known-good
HandsFreeLink control unit (see page 23-388). If the
problem goes away, replace the original HFL-
navigation microphone.
Is DTC B1792 indicated?
Ar e t her e any DT Cs i nd i cat ed ?
Can the client’s problem be duplicated?
Can the voice prompts be recognized?Can y ou d upl i cat e t he pr obl em?
08/08/21 14:18:41 61SNR030_230_0385
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Page 2671 of 2893

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DTC B1792: The HFL system does not recognize all voice
prompts
YES
NO YES
NO
YES
NO
YES
NO
YES
NO
23-38223-382HandsFreeLink System
DTC Troubleshooting (cont’d) Symptom Troubleshooting
HandsFreeLink Control Unit
Internal Error
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), then turn it to
ON (II).
3. Check for DTCs with the HDS.
Replace the HandsFreeLink control unit.
Intermittent failure, the system is OK at this
time. 1. Connect the HDS to the DLC.
2. Clear the DTCs with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to
ON (II).
4. Check for DTCs.
Repair the indicated DTCs.
Go to step 5.
5. Check if the problem is duplicated.
Go to step 6.
The system is OK at this time. Ask the
customer to demonstrate the problem.
6. Check if the navigation system can recognize voice prompts.
Go to step 7.
Refer to the navigation system
troubleshooting (see page 23-342).
7. Pair the client’s phone to a known-good vehicle and try to duplicate the problem.
Call the HFL support desk at 888-528-7876,
and inquire if there are any known issues for the
problem. If there are no known issues, explain to
the client’s this is a system characteristic and
cannot be improved at this time.
Substitute a known-good HFL-navigation
microphone (see page 23- 358). If the problem is
still present, substitute a known-good
HandsFreeLink control unit (see page 23-388). If the
problem goes away, replace the original HFL-
navigation microphone.
Is DTC B1792 indicated?
Ar e t her e any DT Cs i nd i cat ed ?
Can the client’s problem be duplicated?
Can the voice prompts be recognized?Can y ou d upl i cat e t he pr obl em?
08/08/21 14:18:41 61SNR030_230_0385
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Page 2672 of 2893

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The HFL system is locked and the pass code
has been lost or forgotten HFL message cannot be heard or are weak
YES
NO
YES
NO
YES
NO
23-38323-383
1. Connect the HDS to the DLC.
2. Turn the ignition switch to ON (II).
3. From the Body Electrical menu, select
HandsFreeLink.
4. Select Miscellaneous Tests, then select Pass code reset.
5. Follow the HDS prompts to reset the pass code. 1. Turn the ignition switch to ON (II).
2. Check that the audio system is operating normally,
and the speaker sound l evels from different audio
sources (AM/FM, CDs, etc.).
Go to step 3.
Refer to the audio system symptom
troubleshooting.
3. Check the navigation voice recognition system.
Go to step 4.
Refer to the navigation system
troubleshooting.
4. Check the audio system when HFL messages are played.
Go to step 5.
Go to step 10.
5. Turn the ignition switch to LOCK (0).
6. Disconnect navigation unit connector B (24P) and the HandsFreeLink control unit 28P connector.
(cont’d)
Does the audio system work normally, and is theaud i o out put f r om t he speak er nor mal w henpl ay i ng v ar i ous aud i o sour ces?
Does the voice recognition system work properly?
Dose t he aud i o sy st em mut e w hen H F L messagesar e bei ng pl ay ed ?
08/08/21 14:18:42 61SNR030_230_0386
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