2006 GREAT WALL HOVER light

CD Player and Air Conditioning System-3
(Figure 7-2) cable position of 2-pin connector socket

Pos. No. Color Function Pos. No. Color Function
1 Whit e Send the data (TX) 11 Shielded cable Earthing of data cable
2 Red Receive the data (RX) 12 — —
3 Brown Telephone mute (TEL) 13 Blue Automatic antenna (ANT )
4 Orange Lighting (LAMP) 14 Red Ignition power supply (ACC)
5 — — 15 Grounding wire
6 — — 16 Yellow Memory power supply B+
7 Whit e and
black Front left speak (-FL-) 17 Green and black Rear left speak (-RL-)
8 White Front left speak (+FL+) 18 Green Rear left speak (+RL+)
9 Gray and
black Front right speak (-FR-) 19 Violet and black Rear right speak (-RR-)
10 Gray Front right speak (-FR+) 20 Violet {Rear right speak (+RR+)

Possible Troubles of CD Player, Inspection and Analysis

Trouble Descriptions Possible causes, inspection and solutions
No programs received for AM and FM Check if the antenna is pulled out and socket becomes
loosened.
Impurity of sound after radio auto-searching Tune to the correct radio station with manual tuning method
No sound of one speaker Check the speaker a nd the socket or adjust the balance(front,
back, left and right)
Refuse to work Check the power supply, or disconnect and connect the power
supply and restart the player.
No power supply Check if the plug-in fuse and output plug is loosened and if the
fuse is burned down.
Single channel when played Check if the speaker is in open-circuit and examine its plug
Not read CD Check the CD type and if it is placed in reverse or scratched.
Display screen displaying bad Check the connecting wire of display screen or adjust the
brightness level higher
Air conditioner refuses to start Inspect the ECU of air conditioner and air conditioning system
Button failure of air conditioner Inspect the ECU of air conditioner and air conditioning system

A-side V iew

CD Player and Air Conditioning System-6
Turn the ignition switch from OFF to ON
The display symbols all light up
failure of the switch or display tune
NO
Press down “Temp+” switch
Enter into self-diagnosis procedur1?
NO“ Te mp +” switch failure
Step 1:
Display “01”
(set t he temperature zone)
all other display symbols turn of
f
Press
down
“Temp+” switch
Step 2: Display
“02”(set the
temperature
z one)
The inspection procedures
During the period of 10 seconds after the engine is started(turn the ignition switch from OFF to ON), press OF F, A U T O ,
RR and MODE once more, and the pressing of MODE switch shall last at least 2 seconds
.
A ll sensors are good.
Display
“000”(outsidetemperature)

CD Player and Air Conditioning System-12
e .Precautions for the overhaul of air cooling system
When the air cooling system encounters the trouble, the cause for such trouble shall be analyzed inlightof trouble varieties,
followed with the examination and report work.
c. T he c ooling system some time s w orks wh ile some time s refus es towo rk.
T rou ble Des cri p tion s Ana l ysis o f the C ause
1.comp ress or wo rks n orma l l y 1.
ice b lock i nthe c ool i ng s yste
m
2. failu reof therma l resisto r o r tem perature sens ing b ul
b
3. poor contac t o f A /Cswitch
4. cond ensing blow erdama ge
d
T he c ooling system
so me time s p rodu ce
s
re f ri g eratio n e f f ect whil
e
so me time s not
.
comp resso r w orks i mprop erl y 1.s
lid e o f the clut ch
2. comi ng off o f the clut ch ’ s wind i n
g
3. poor earthi ng ofclut ch ’ s wind i n
g
d. N oise o f the air c oolin g s ystem
T r ou ble Des cription s Ana l ysis o f the C ause
No ise o f the air c ooling system too
lo ud N o
ise t oo l oud (1
) b elt t oo
loos e or w orn t oo mu ch
(2 ) f asteni ng screw o f mounting h olde r o f the comp resso
r
lo os en ed
(3 ) m ounti n g h olde r o f the comp resso r dam aged
(4 ) i nter na l p arts of the c om pr
esso r dam aged
(5 ) t oo mu chref ri g eratio n o ilor none
(6 ) .
slid e o f the clut ch
(7 ) . B e aring o f the clut ch runni ngshort o f o i lor dama ge
d
(8 ) . mo tor b earing ofthe b lowe r dam aged
(9 ) h olde r o f the blow erbrok en or
loos ened
(1 0) blad e o f the blow erbrok en or
loos ened
(1 1) . F rict io n o f the blow er’ s blad e w ith o ther comp onents

Safety airbag-5
Test instrument
InstrumentNameUtility
diagnostic scanner
The alarm lamp
keeps illuminating.Failure
handlingDebug the
failure codes
Test the systematic failures in
SRS safety airbag system, debug
ECU. failure codes.
The basic failure diagnosis process
The failure code DTC of both present and history-accumulated failures may co-exist.
Caution
The safety airbag alarm lamp flashes for 6 times and then extinguishes when the ignition switch is in ON
position after the installation of new safety airbag system electronic control unit, which demonstrates the
normal function of SRS safety airbag system. In this case the system does not need to be tested, otherwise it
should be diagnosed and repaired.
If the alarm lamp does not illuminate when the ignition switch is in ON position, repair the alarm lamp relevant
circuit and, then further operate to get it into work.
Scan the ECU by connecting
the scanner with k-lineFailure detection
The test for SRS safety airbag alarm lamp
SRS-ECU will execute a series of diagnosis and test to check whether the function of airbag system is prepares. The check can
prevent the restriction system from mis-explosion and ensure the necessary explosion during collision. If found the failure,
SRS-ECU will save a proper failure code and light the alarm lamp to indicate a failure status for the convenience of maintenance.
If connect the pin 2# wire 488# (diagnosis request wire) on the diagnosis port to the ground (wire 50#) for more than 2s, the
safety airbag alarm lamp will flash the code. For detailed position refer to following figure.safety airbag system alarm lamp

Safety airbag-6
brown whitered
diagnosis plug
black
Failure judgment
1. Failure record (failure code storage)
When ECU determines the error through the cyclic diagnosis and test, SRS-ECU should saves the corresponding code, first
judgment time, final judgment time and number of occurrence in EEPROM.
RS-ECU can stores 6 failures at most, under voltage failure and two collision records (front and side).
Failure code approved by SRS-ECU
Serial No. Failure description Debugging
1 Ignition loop 1 (driver ’s front airbag), resistance is too high or open-circuit. Can
2 Ignition loop 1 (driver ’s side front airbag), resistance is too low or short-circuit Can
3 Ignition loop 1 (driver ’s side front airbag), grounding Can
4 Ignition loop 1 (driver’s side front airbag), connected to power supply Can
5 Ignition loop 2 (passenger side front airbag), resistance is too high or open-circuit. Can
6 Ignition loop 2 (passenger side front airbag), resistance is too low or short-circuit Can
7 Ignition loop 2 (passenger side front airbag), connect ed t o power supply Can
8 Ignition loop 2 (passenger side front airbag), connect ed t o power supply Can
9 Power voltage is high Can
10 Power voltage is low Can
11 Alarm light failure, connect ed to power supply or lamp is short-circuit Can
12 Alarm lamp is failure- grounding or filament is open-circuit. Can
13 Shortage/failure of algorithm parameter Cannot (replace the
SRS-ECU)
14 The front collision is recorded Cannot (replace the
SRS-ECU)
15 Communication failure Can
16 Internal failure (refer to following table) Cannot (replace the
SRS-ECU)

Safety airbag-7
Description of flash code
The failure code transmission is completed by SRS-ECU’s input to the defined diagnostic scanner through the maintenance system’s
serial data interface. (X-431 diagnostic scanner) Failure code of diagnosis
Failure Failure code Flash code
1 No storage error $12
2 Front airbag driver’s, high resistance $9,021 $21
3 Front airbag driver’s , low resistance $9,022 $22
4 Front airbag driver ’s, short-circuit of GND $9,024 $24
5 front airbag driver ’s , short –circuit of VBATT $9,025 $25
6 front airbag passenger, high resistance $9,015 $15
7 front airbag passenger, low resistance $9,016 $16
8 front airbag passenger , short-circuit of GND $9,018 $18
9 Front airbag passenger , short-circuit of VBTT $9,019 $19
10 High voltage of battery $9,031 $31
11 Low voltage of battery $9,032 $32
12 Failure of alarm lamp $9,061 $61
13 Internal failure (replace SDM) $9,071 $71
14 Front collision record $9,051 $51
15 Side collision driver’s record $9,056 $56
16 Side collision passenger record $9,057 $57
17 Retightened safety belt collision $9,058 $58
18 Beyond the allowable repeat usage times $9,054 $54
3. Interior failure
The micro controller can test the following items not only in starting detection but also in cyclic diagnosis detection.
a. Ignition circuit triggers the transistor: The high-side transistor is detected not only in the starting detection but also in the
circulation diagnosis. But for the low-side transistor is opened when is connected to power supply directly, so the low-side
transistor only can be detected in the starting detection to avoid the misexplosion.
b. The ignition voltage is provided by the booster transformer.
c. The acceleration sensor is detected by itself when start the detection.
d. Allowable deviation scope of acceleration sensor in circulation diagnosis.
e. Micro controller includes (AD converter, ROM, RAM etc.)
f. Status of safety sensor
Cautions:
Connector of explosion tube circuit has the short-circuit bar. When the connector is not connected, the end (+) of
explosion tube is connected to end (-) directly to prevent the failure outspread caused by static. When the connector
is bas and short-circuit bar is connected, the failure may not be eliminated.
An external watch dog can detect the operating status of micro controller. It can trigger the watchdog when the micro con
troller has failure. The watch dog will reset the micro-controller and light the alarm lamp.

Safety airbag-8
Internal failure determined by SRS-ECU
Serial
No. List of failure Description of failure
1 Micro-controller AD converter or EEPROM is faulty (the micro controller will be reset
and alarm lamp is light when the RAM has failure.)
2 Driver’s front airbag ignition loop Enable the failure
Measure the failure of loop
3 Passenger front airbag ignition loop
(if realized) Enable the failure
Measure the failure of loop
4 Seat safety belt preloaded ignition loop
(if realized) Enable the failure
Measure the failure of loop
5 Passenger side safety belt preloaded
ignition loop (if realized) Enable the failure
Measure the failure of loop
6 Driver’s side airbag ignition loop
(if realized) Enable the failure
Measure the failure of loop
7 Passenger side airbag ignition loop
(if realized ) Enable the failure
Measure the failure of loop
8 Maximum times of explosion of safet y
belt pre-tightener Reach the maximum value 6
9 Holding time of ECU ener gy
(self-supply time) Too short
10 Accelerometer Deviation range
Sensor not in constant, stable model
Sensor tests the failure itself
11 The measurement of ignition loop is
rejected continuously No cycling diagnosis test (duplicated calculation)
12 Safety sensor Calculate the safety sensor open-loop using the method that power-off
for 2 or more than 2 seconds is considered as passing
13 Initial firing current All initial firing current in normal status when the front airbag releases.
14 The ignition of side airbag is not
determined. Though SRS-ECU has received ignition information for 5 times during
HSIS cycling ignition, the ignition can not be determined due to the side
safety..

Debug the failure codes
Approach 1. The failure codes will be debugged following the ECU’s receipt from the X-431 diagnostic tester of the debugging
failure codes order through the serial interface, however, if an internal failure code is recorded or one impact is
recorded, the debugging will not be executed.
Approach 2. Ground 488# line for 5 times in 10 seconds to debug the failure codes.
Failure status display (alarm lamp keeps illuminating).
1. Bulb test
SRS-ECU will light the alarm lamp in order to test the bulb after working voltage is provided to it through the battery. The lamp
will flash for 6 times and then extinguish at 1HZ in the initial phase. The alarm lamp will keep illuminating after the working
voltage is provided in order to inform the driver’s system failures. The alarm lamp will keep illuminating for 6 seconds after the
ignition on and then be extinguished if the history-accumulated failures are less than five times. In the initial phase, SRS-ECU will
not prepare to test impact and stop release till the circuit is stable. Therefore, alarm lamp’s display manner will be one of
following projects in the initial phase. (Table 4.9).
Project 1. If the impact is recorded or the number of history accumulated failures is or more than 5,the alarm lamp will keep
illuminating, simultaneously, it will also keep illuminating if there is a possible explosion failure.

Safety airbag-9
Project 3 functional working (neither possible explosion failure or historical failure).
Table 4.9 indicator lamp’s activities after ignition
2.Failure indication
The alarm lamp will indicate it in case any failure arises. If the external failure is a historical one, the indication will be called off. If
the number of history-accumulated failures is or more than 5, the alarm lamp will keep illuminating albeit no failure emerges. The
case of low power will be excluded.
A displayed or historical failure can but only be reconfigured by the service personnel. An internal failure or impact record can not
be reconfigured, in these cases, SRS-ECU must be replaced.
3.Micro controller-independent alarm lamp illumination
The micro-controller in clear failure status can not work therefore can not control the alarm lamp. In this case, the alarm lamp
will be directly lighted via suitable circuit despite of the micro-controller. As following,
The battery for SRS-ECU fails, the alarm lamp will be continuously lighted through the lamp drive function.
b. No internal working voltage, the alarm lamp keeps illuminating
c. Reconfiguration caused by watchdog’s trigging failure, the alarm lamp flashes.
d. No work of micro-controller, the alarm lamp keeps illuminating
e. Incomplete plugging-in of SRS-ECU connector, the alarm lamp keeps illuminating via shoring bar Next explain the diagnostic
procedure by taking some examples
If the alarm lamp is found keeping illuminating, please test it according to the following procedure even it extinguishes finally.
First test the failure region with the scanner followed by the test in the failure region with the corresponding approaches and
steps.
a If an internal failure or the explosion of safety airbag is scanned, replace the SRS-ECU
b.Troubleshooting Project 2. The number of history- accumulated failures is or more than one and less than 5. (The case of low power is excluded)