2006 GREAT WALL HOVER ECU

Safety airbag-10
1. Extinguishments of safety airbag system alarm lamp
Troubleshooting
Extinguishments or normal-light of alarm lamp
NO . Troubleshooting item Description
1 T he warning la mp of safety a irbag
system is not displayed. Safety airbag system warns circuit failure
2 T he warning la mp of safety a irbag
system is light normally. Safety airbag system warns circuit failure or external
failure.

1 Extinguishments of safety airbag system alarm lamp
Test status Safety airbag system warns circuit failure.
Possible causes No voltage (fuse shutoff)
Combined instrument failure
Failure of wiring harness between instrument cluster and ECU unit

Diagnostic procedure
When first carry out failure test, joggle the wiring harness and plug to test whether there is periodical bad contact in the circuit, if
it so, please confirm whether the plug, terminal and wiring harness well connected and in good condition. If it is not any of previous
cases, operate according to the following steps.
Procedure Te s t Operation
Ye s Place the ignition switch in LOCK
position followed by next step
1 Test other wiring harness and instrument cluster
indicator lamp
·place the ignition switch in ON position
·light other alarm and indicator lamps No Test the instrument cluster power-supply
system and grounding s ystem (fuse), then
go to step 5.
Yes Next step
2 Bulb test
Warning:
Incorrect handling with the safety airbag system
units will cause the safety airbag’s improper
release and pretension of safety belt, which will
lead to serene accidents. Please read safety airbag
service warning before handling the safety airbag
units.
·Place the ignition switch in LOCK position。
·shut off accumulator negative line and keep the
status for at least 60 seconds.
·Remove the combined instrument.
Test the connection between the two
corresponding stitches of safety airbag alarm lamp No





Rep la ce th e b ulb of a larm la mp.

Safety airbag-11
2. Normal-light of safety airbag system indicator lamp
2 Normal-light of safety airbag system alarm lamp
Test status Normal-light of safety airbag system alarm lamp
Possible causes Insufficient battery voltage
ECU internal failure
Combined instrument safety airbag alarm lamp failure
ECU plug misconnects
Combined instrument plug bad-contact
ECU power-supply fuse shutoff or bad contact
Misconnection of ECU plug terminal
Bad contact between ECU plug terminal and grounding wiring
harness.
Driver ’s or passengers’ side safety airbag circuit failure.

Procedure Te s t Operation
Yes Next procedure.
3 Test the wiring harness connection between ECU
unit and instrument cluster.
·Place the ignition switch in LOCK position。
·shut off accumulator negative line
·shut off the instrument cluster plug
·test the connection b etween alarm lamp circuit
and its relative circuits No Replace the wiring harness and get into
step 5

Safety airbag-12
Begin the test with diagnostic communication with special diagnostic device (X-431 diagnostic tester) and ECU
to find out the failure causes, do the next test providing communication is not successful.
Procedure Te s t Operation
Yes Next procedure
1 Test the battery
Test the battery voltage
Is the voltage higher 9V? No Insufficient battery supply.
Test the charging/discharging
system, then go to step 5.
Yes Next step
2 Test the wiring harness connection between ECU and
combined instrument.
Place the ignition switch in LO C K position。
Shut off the battery negative.
O pen the central channel guard plate.
Shut off the instrument combined connector clip
Connect the negative of battery
Place the ignition switch in ON position.
Check whether the instrument connector clip terminal
voltage is 12V(power supply and instrument line) No Check the circuit and continue the
operation according to step 5.
Yes Next step
3 Place the ignition switch in LO C K position。
Check the connection of corresponding terminals between
instrument connector clip and diagnostic interface
(diagnose the two ends of K-line) No Repair or replace the wiring
harness and continue according to
step 5
Yes Next step
3 Make sure the shutoff of accumulator negative line and
keep the status for at least 1 minute.
Shut off ECU connector clip
Shut off the instrument cluster plug.
Connect the ECU plug terminal 5,7,9 and instrument
cluster plug? No Replace the wiring harness and
step 5
Yes Replace ECU
4 Remove EC U to check the condition of term inal and
whether the shorting bar is broken.
No Reconnect EC U connector clip
and next step.
Yes Troubleshooting followed by the
explanations to customers upon
the repair ing pro ced ur e.
5
Make sure that the failure will never reoccur after
repairing.
Place the ignition switch in LO C K position。
Shut off accumulator negative line and keep the status for
at least 1 m in ute.
Connect all ECU plugs
Connect the driver’s side safety airbag combined
instrum ent p lug
Connect the passengers’ side safety airbag combined
instrum ent p lug
Connect the driver and passengers’ side pretension safety
belts plugs.
(Vehicles with pretension safety-b elts)
Connect clock spring plug
Connect the accumulator negative line
Place the ignition switch in ON position
Does the safety airbag alarm lamp work functionally? No Retest the failure symptoms;
repeat from step 1 if the failure
reoccurs.

Safety airbag-18
Impact-vehicle diagnosis
Test SRS-ECU diagnostic signals
1. Connect the (X-431 diagnostic test’s) diagnostic joint
2. Read the diagnostic results with X-431 diagnostic tester
Repairing procedure
1.When safety airbag is released.
The following parts should be replaced with new ones
a. Passengers’ side safety airbag module
b. SRS-ECU
c. Driver’s side safety airbag module
2 Check the following parts; replace them with new ones providing something wrong with them.
a. Clock spring
b. Steering-wheel, steering column, bottom steering shaft module
3.Driver’s side safety airbag module’s installation status towards the steering wheel.
a. Check whether abnormal knocking is with the steering wheel, its activity is in good condition and its clearance is normal.
b. Check whether the wiring harness joint is broken and its terminal is deformed.
Caution: Due to the impact, the diagnostic instrument cannot communicate with SRS-ECU when accumulator is lack of
power, in this case, check and maintain the instrument panel wiring harness or utilize the extension power supply.

Safety airbag-19
1. Check whether depression, crack or deformation is with the SRS-ECU bracket.
2. Check whether the joint is broken and terminal is deformed
3. Check SRS-ECU bracket’s installation status
a. Check whether depression, crack or deformation is with the shroud
b. Check whether the joint is broken, terminal is deformed and wiring harness is meshed.
c. Check whether depression, crack or deformation is with the gas generator shield.
d. Make sure the direction of the arrow is straightforward
4. Check the installation status of safety airbag module.
Driver’s side safety airbag module (the following Figure)
generator
bracketconnect the hornconnect the driver’s side
module
Clock spring (right Figure)
1. Check whether the joint and protecting tube are broken and the terminal is deformed.
2. Check whether the shield is deformed.
Steering wheel, steering column and bottom steering shaft module
1. Check the installation status of driver’s side safety airbag module
2. Check whether abnormal knocking is with the steering wheel and its clearance is normal
Passengers’ side safety airbag module (the following Figure)
1. Check the installation status of passengers’ side safety airbag module
2. Check whether the shield is deformed

Safety airbag-20
Wiring harness joint (instrument cluster wiring harness)
Check whether the wiring harness is well installed, the joint is broken and the terminal is deformed.
Warning
The attentions for use and maintenance for SRS safety airbag are displayed in the Figure. Operate according to the sign and, the
destructed and dirty sign must be replaced with a new one steering
wheel in Figure6-1
Driver’s side safety airbag module in Figure 6.2
Clock spring in Figure 6.3
SRS-ECU in Figure 6.4
Sun visor in Figure 6.5
Passengers’ side safety airbag module in Figure 6.6
Passenger side airbag (PAB)

Safety airbag-21
Removal methods for all the parts
Safety airbag electronic-control unit
Caution
Continue the operation 60 seconds after the removal of accumulator negative. Wrap the removed negative with
insulating tape for insulation.
2. The SRS-ECU must not be separated nor repaired replace the failed SRS-ECU with a new one.
3. Prevent the SRS-ECU from shock and vibration, replace the SRS-ECU with depression, crack or deformation with a
new one.
4. Do replace the SRS-ECU with a new one after the safety airbag is released.
5. Do not damage the SRS-ECU when removing or maintaining the parts next to it.
Figure 61 Figure 62
Figure 6
3 Figure 64
Figure 6
5 Figure 66 warning signswarning signs
passengers’ side safety airbag module
warning signs

Safety airbag-22
1. Operations before removal
a. Place the ignition switch in OFF position.
b. Remove the accumulator negative and well preserve it somewhere or wrap it with tape.
2. Removal procedure.
a. Central channel’s side panel (or remove the co-instrument panel)
b. Remove the connector clip connecting with the safety airbag ECU
3. Installation sequence
a. SRS-ECU;
b. Install the connector clip connecting with the safety airbag ECU
c. Central channel’s side panel (or remove the co instrument panel)
d. Connect the grounding jumper.
4. Some points for installation
a. SRS-ECU installation
b. Post-installation test
Place the ignition switch in ON position
SRS alarm lamp flashes in 6 seconds and extinguishes.
c. If not extinguishes, the failure test and troubleshooting must be done.
5. Test
a. Whether the depression, crack or deformation is with the SRS-ECU shield.
b. Whether the terminal is broken or deformed.
Caution: The SRS-ECU safety airbag will not work normally if the SRS-ECU is not correctly installed.
Caution: The SRS-ECU with depression, crack or deformation must be replaced with a new one.
For the inspection of SRS-ECU besides the previous refer to related item of troubleshooting