Page 2663 of 2893
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23-375
3
27
HANDSFREELINK CONTROL UNIT
MIC
SIG
MIC
SIG HFL
MUTE
BRN
YEL
HFL-NAVIGATION
MICROPHONE HFL
ICON
TELEM
SIG TELEM
SIG
12 13 14
D8 D7 D9 B8 B20 B21 B9
GRY
MIC
SIG MIC
SIG HFL
MUTEHFL
ICONTELEM
SIG TELEM
SIG
GRN RED LT BLU LT GRN BLU PNK
GRY
MIC
SH
GRY
B-CAN
18
PNK
PNK
LT BLU
MICU PNK
Q6
DATA LINK
CONNECTOR
(DLC)
GAUGE CONTROL
MODULE (TACH)
CLIMATE CONTROL
UNIT
28
191125 26
Q8
UNDER-DASH FUSE/RELAY BOX
AUDIO
REMOTE
GND
A5
BRN
A 7B24
B12B10
GRY
RED WHT
6
20 HFL/NAVI
COMM2
B23
BLK GRN
21B11
GRY8
HFL/NAVI
COMM1
HFL/NAVI
COMM3HFL/NAVI
COMM4HFL/NAVI
COMM SH
HFL/NAVI
COMM2
HFL/NAVI
COMM1 HFL/NAVI
COMM3
HFL/NAVI
COMM4HFL/NAVI
COMM SH MIC
SIG SH
TELEM
SIG SH
MIC MIC
NAVIGATION UNIT
12
ORN
MOONROOF
SWITCH
3 *: The shielded wires have a heat-shrunk tube
insulating the outside of the wire. The color
of the insulating tube, typically black or dark gray,
may not match the color of the wire listed on the
schematic.
: CAN line
: Shielding
*
*
*
*
*
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Page 2664 of 2893
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DTC B1775:
YES
NO
YES
NO
YES
NO
23-376HandsFreeLink System
DTC Troubleshooting
HANDSFREELINK CONTROL UNIT 28P CONNECTOR
MIC (YEL)
HANDSFREELINK CONTROL UNIT 28P CONNECTOR MIC (YEL)
HFL-NAVIGATION MICROPHONE 3P CONNECTOR MIC (YEL)
Microphone Input/Output Short
to Power/Open
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.
7. Turn the ignition switch to ON (II). 8. Measure the voltage between HandsFreeLink
control unit 28P connector terminal No. 13 and
body ground.
Short to power in the wire between the
HandsFreeLink control unit and the HFL-navigation
microphone. Replace the affected shielded
harness.
Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 13 and the
HFL-navigation microphone 3P connector terminal
No. 1.
Go to step 11.
Open in the wire between the HandsFreeLink
control unit and the HFL-navigation microphone.
Replace the affected shielded harness.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is DTC B1775 indicated? Is there voltage?
Is there continuity?
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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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Page 2666 of 2893
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YES
NO
YES
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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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 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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