Geely Emgrand X7. Manual part — 503

11.2.6 Diagnostic information and steps

11.2.6.1 Diagnosis descriptions

Refer to 11.2.2.1 description and operation, get familiar with the system functions and operation
before starting system diagnosis, so that it will help to determine the correct diagnostic steps, more
importantly, it will also help to determine whether the situation described by the customer is
normal.

11.2.6.2 Visual inspection

–

Inspect installed aftermarket equipment that may affect the operation of the audio system.

–

Inspect components easy to access system to identify whether there is a significant damage
that may lead to the fault.

–

In the event of all speakers inoperation, focus on speaker circuits that are easy to short to
ground, as it will help troubleshoot quickly.

–

If a single speaker is inoperative, it may because the audio channel is shielded, causing a
single channel inoperative. It is not an audio system malfunction. Refer to the audio system
instructions in the user manual.

11.2.6.3 Audio main machine can not start

Circuit diagram:

NL11-2005b

8

IP21

7

IP21

4

IP21

10A IF20

15A IF14

ACC

GND

+B

ACC

ALT

收放机

Diagnostic steps:

1

Check fuseIF20 and IF14.

Radio-casset

te player

2011

(a) Whether fuse IF20 and IF14 are
burned out.

The rated current of the fuses is: 10A
for IF20 and 15A for IF14.

Confirm whether the fuses are blown.

NL02-2006b

IR05

85

86

8 7

3 0

IR02

8 5

8 6

8 7

3 0

IR07

8 5

86

87

3 0

4

IR01

2

1

5

3

4

2

1

5

3

IR04

IR03

8 5

8 6

8 7

3 0

IF 1 4

IF 1 4

IF
2

9

IF
3

2

IF
3

3

IF
3

4

IF
3

5

IF
1

8

IF 2 0

IF 2 0

IF 11

IF
2

5

IF
2

6

IF
2

7

IF
2

5

IF
0

1

IF
0

2

IF
0

3

IF
0

4

IF
0

5

IF
0

6

IF
2

6

IF
2

7

IF
2

3

IF

3

0

IF

1

2

IF

1

6

IF

1

7

2

Check fuseIF20 and IF14 circuit

A. Check whether Fuse IF20 and Fuse IF14 lines are short circuited.

B. Repair the circuits,confirm that there are no short circuits.

C. Replace the fuses with rated current.

Confirm whether the radio is working correctly.

3

Inspect the audio head unit power supply.

A. Dismantle the audio head unit.

B. Measure the voltage of audio

head unit harness connector IP21
terminal No. 7, 4.

NL11-2007b

7

5

3

1

2

8

6

4

IP21 收放机线束连接器1

4

7

Yes

The system is normal.

No

Yes

No

Go to step 3

IP21 radio-cassette player

harness connector1

2012

Standard voltage

Test terminal

Test conditions

Standard voltage

IP21(7) —— body grounding

Always

11-14 V

IP21(4)——body grounding

Ignition switchACC

11-14 V

4

Repair the open circuit fault between the audio head unit wire harness connector IP21
and the fuses IF20 and IF14.

(a) Confirm the open circuit malfunction between audio head unit harness connector IP21

terminal No. 7 and fuse IF14 maintenance is completed.

(b) Confirm the open circuit malfunction between audio head unit harness connector IP21

terminal No. 4 and fuse IF20 maintenance is completed.

Confirm whether the radio is working correctly.

5

Inspect the audio head unit grounding.

(a) Use multimeter to measure

resistance between wire harness
connector IP21 terminal No. 8 of
main host of sound equipment
and grounding circuit.

Standard resistant value :is less than 1
Ω

Confirm if the resistance conforms to
standard value.

NL11-2008b

7

5

3

1

2

8

6

4

IP21 收放机线束连接器1

8

Yes

Go to step 7

No

Yes

The system is normal.

No

Yes

Go to step 5

No

IP21 radio-cassette player

harness connector1

2013

6

Repair the open circuit fault between the audio head unit wire harness connector IP21
and the body grounding.

(a) Confirm the open circuit malfunction between the audio head unit harness connector IP21

terminal No. 8 and the body ground maintenance is completed.

Confirm whether the radio is working correctly.

7

Replace audio main machine

A. See "11.2.7.5 replacement of audio unit".

Confirm whether the radio is working correctly.

8

The system is normal.

Next

Yes

The system is normal.

No

2014