269 

 
No. 194 Onboard hand-free phone has no sound output (MK)   

Malfunction Cause 

Solution 

①

Low sound volume set 

①

Set it louder 

②

Unmatch cell phone type or interface

②

Replace it with cell phone or interface matching with 

the vehicle 

③

Phone mute outputline switch or 

external controlling circuit damaged   

③

Remove phone mute outputline to inspect the 

damaged part, internal or external controlling circuit 

④

Dirt on connector conducting point 

④

Clean conducting point by special cleaning solution or 

replace with new connector of same specification. 

⑤

Connector wire core disconnected 

(open circuit) 

⑤

Measure loudspeaker outputline by multimeter, to 

check whether it is disconnected. Replace with new 
connector of same specification. 

⑥

Short circuit between phone mute 

outputline and earthlead 

⑥

Measure the connection between phone mute 

outputline and earthlead by multimeter, to check whether 
there is short circuit. (Remove phone mute outputline to 
inspect the damaged part, internal or external controlling 
circuit) 

⑦

Internal CD-player malfunction 

⑦

Replace CD-player assembly 

No sound output when 
using onboard hand-free 
phone 

⑧

Onboard hand-free phone controller 

malfunction 

⑧

Replace onboard hand-free phone controller 

 

 
 

 

 

270 

 

Cell phone or interface unmatch 

No sound output when using onboard 

hand-free phone 

Low sound volume set 

Phone mute outputline switch or external 

controlling circuit damaged 

Dirts on connector conducting point 

Short circuit between phone mute outputline

and earthlead 

Controller wire core disconnected (open 

circuit) 

Internal CD-player failure 

Onboard hand-free phone controller 

failure 

Set it louder 

Replace switch or external controlling 

circuit 

Clean or replace with new connector of 

same specification 

Replace with cell phone matching with 

vehicle 

Check phone mute outputline external controlling circuit 

whether it is short circuit.normal 

Replace with new connector of same 

specification 

Replace CD-player assembly 

Replace onboard hand-free phone 

controller 

Abnormal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Normal 

 
 

 

 

271 

 
No. 195 CD-player/radio button out of control   

Malfunction Cause 

Solution 

①

Button stuck 

Rock around of the button until it senses normal   

②

Improper operation 

Press RST button by sticker to reset the player, 
then it will be recovered.   

CD-player/radio button out 
of control 

③

CD-player/radio inner malfunction 

Replace CD-player/radio assembly 

 

 

No. 196 CD-player/radio button indicator malfunction   

Malfunction Cause 

Solution 

①

Fuse disconnected 

①

Replace fuses 

②

Lamp controlling line loose 

②

Fix the wire 

③

 Lamp controlling switch fails or not 

locates at ON position. 

③

Directly connect the lamp controlling outputline 

to positive pole of vehicle battery, for inspecting 
the switch. If the lamp lightened then the switch 
damaged. The switch shall turn to ON position. 

④

Lamp controlling wire core disconnected 

(open circuit) 

④

Measure lamp controlling outputline with 

multimeter, to check whether it is disconnected. If 
there is open circuit, replace connector of same 
specification. 

⑤

Dirt on connector conducting point   

⑤

Check dirt on connector conducting point, and 

clean it if necessary. 

CD-player/radio button 
indicator malfunction 

⑥

CD-player/radio inner circuit short 

connected  

⑥

Replace CD-player/radio assembly 

 

Rock around of the button until it senses normal 

CD-player/radio button out of control 

Button stuck 

Improper operation 

CD-player/radio inner malfunction 

Press RST button by sticker to reset the player, then it will be 

recovered 

Replace CD-player/radio assembly 

Abnormal 

Abnormal 

Abnormal 

Normal 

Normal 

 
 

 

 

272 

 

CD-player/radio button lamp 

malfunction 

Fuse disconnected 

Replace fuse 

Lamp controlling line loose 

Lamp controlling switch fails or not 

locates at ON position. 

Lamp controlling wire core 

disconnected (open circuit) 

Dirts on connector conducting point 

CD-player/radio inner circuit 

short/open circuit 

Fix lamp controlling line 

Replace switch with same specification or turn lamp controlling 

switch to ON position. 

Replace connector with same specification

Clean or replace with new connector of same 

specification 

Replace CD-player/radio 

assembly 

Normal 

Normal 

Normal 

Normal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Normal