Great Wall Hover. Manual — part 93

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)

Safety airbag-10

1. Extinguishments of safety airbag system alarm lamp

Troubleshooting

Extinguishments or normal-light of alarm lamp

NO. Troubleshooting

item

Description

1

The warning lamp of safety airbag

system is not displayed.

Safety airbag system warns circuit failure

2

The warning lamp of safety airbag

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

Test

Operation

Yes

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 system (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

Replace the bulb of alarm lamp.

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

Test

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 between 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

Test

O peration

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 LOC K position。

Shut off the battery negative.

Open 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 LOC 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 terminal 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 repairing procedure.

5

Make sure that the failure will never reoccur after

repairing.

Place the ignition switch in LOC K position。

Shut off accumulator negative line and keep the status for

at least 1 minute.

Connect all ECU plugs

Connect the driver’s side safety airbag combined

instrument plug

Connect the passengers’ side safety airbag combined

instrument plug

Connect the driver and passengers’ side pretension safety

belts plugs.

(Vehicles with pretension safety-belts)

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.