188Symptom Suspe cte d Area
1. Ha rne ss or connec tor.
2. ABS controlle r or ABS wa rning light driver module
3. C ombina tion me te r a s s e mbly
1. Ha rne ss or connec tor.
2. SRS controller
3. C ombina tion me te r a s s e mbly
1. Ha rne ss or connec tor.
2. SRS controller
3. C ombina tion me te r a s s e mbly
1. Ha rne ss or connec tor.
2. O il pr e s s ur e s w it c h a s s e mbly
3. C ombina tion me te r a s s e mbly
1. Ha rne ss or connec tor.
2. Headlamp light control switch
3. C ombina tion me te r a s s e mbly
1. Ha rne ss or connec tor.
2. Headlamp light control switch
3. C ombina tion me te r a s s e mbly
1. Ha rne ss or connec tor.
2. Ce ntra l c ontrolle r or re a r de fros t sw itc h
3. C ombina tion me te r a s s e mbly
1. Ha rne ss or connec tor.
2. Electric Power Steering controller
3. C ombina tion me te r a s s e mbly
1. Ha rne ss or connec tor.
2. Engine c oola nt te mpe ra ture se nsor
3. C ombina tion me te r a s s e mbly
1. Ha rne ss or connec tor.
2. Se a t belt buckle switch
3. C ombina tion me te r a s s e mbly ABS warning light doe s not light up
SRS wa rning light doe s not light up
SRS (Sub) indic a tor doe s not light up
Oil pre ssure wa rning light does not light
up
Water temperature warning indicator
doe s not light up
Se at be lt wa rning indic a tor doe s not light
up High be a m indica tor does not light up
Re a r fog indica tor does not light up
Re a r defrost indic a tor doe s not light up
EP S wa rning indic ator doe s not light up
19210. INSPECT PARK BRAKE SWITCH
(1) Disconnect the connector from the park brake switch.
(2) Pull up the hand brake, inspect continuity between its terminal and ground.
Hand brake is pulled up: Continuity
Hand brake is released: No continuity
11. INSPECT BRAKE FLUID LEVEL WARING LIGHT
(1) Disconnect the connector from the brake fluid level sensor.
(2) Turn the ignition ON, the brake fluid level warning light should go out.
(3) Directly connect its connector terminal to the harness terminal with a wire, the brake fluid level warning
light should light up.
12. INSPECT BRAKE FLUID LEVEL WARING SWITCH
(1) Remove the reservoir cap
(2) Disconnect the connector from the reservoir.
(3) Inspect continuity between terminals
Float up: No continuity
(4) Use siphon to take fluid out of the reservoir.
(5) Inspect continuity between terminals
Float down: Continuity
(6) Pour the fluid into the reservoir
13. INSPECT THE REAR DEFROST INDICATOR
(1) Turn the ignition switch ON, and start the engine
(2) Press the defrost switch, the rear defrost indicator will light up
(3) Turn the ignition OFF, the rear defrost indicator should go out.
14. INSPECT THE REAR DEFOG INDICATOR
(1) The rear fog indicator will light up as the rear fog lamp lights, the terminal B1 is at the high electric
potential.
15. INSPECT THE SEAT BELT WARNING INDICATOR
(1) Disconnect the seat belt switch connector in the driver's side, the belt warning indicator should go out at
this time.
(2) Short connector terminal to the ground, the belt warning indicator should light up.
242Chapter 7
SRS (Supplemental Restraint System)Section 1 SRS-General InformationI. PRECAUTIONFor safe reasons, read the following precautions before starting any operation.
1. When servicing the SRS, correct sequence and items are described in the following chapter.
2. Instruments and special tools recommended in this chapter shall be used for operation.
3. When servicing the following components, replace them with the new ones if there is a failure.
(1) SRS ECU
(2) Clock Spring Module
(3) Driver Airbag Module
(4) Passenger Airbag Assembly (Option)
4. If there is any abnormality in the wire harness of the SRS, replace it with a new one. Correct or replace the
abnormal wire harness in accordance with Table 1.
Figure 1 (Table 1)No De signation De scription
1 Belt-pretensioner, Driver, Low Seat belt pretensioner, driver side, low position
2 Belt-pretensioner, Driver, High Seat belt pretensioner, driver side, high position
3 Belt-pretensioner, Passenger, High Seat belt pretensioner, passenger side, high position
4 Belt-pretensioner, Passenger, Low Seat belt pretensioner, passenger side, low position
5 IGN Battery voltage
6 GND Ground-ground w ire
7 WL Airbag w arning light
9 K Diagnostic serial data I/O (K line)
10 DAB Hi Driver airbag, high positionE C U T e r mina l D e s c r ipt ion
2454. Trouble Identification
(1) Trouble Record (DTC storage)
When the circular diagnostic tests are involved in identification of a trouble, the SRS ECU (HAE2.5) will
store relevant codes, first/last diagnosis time and frequency of the trouble in EEPROM.
ySRS ECU (HAE2.5) can store up to 6 troubles, low voltage trouble as well as two crash records (front
and side).
yThe transmit of the DTCs are carried out in the way that the SRS ECU£¨HAE2.5£©via serial data
interface of the maintenance procedures assign the codes to the diagnostic detector.No. Trouble De scription Trouble shooting
1Ignition c irc uit 1 (drive r a irba g), high re sista nc e or ope n
circui
tYes
2Ignition circuit 1 (driver airbag), low resistance or short
circuitYes
3 Ignition circuit 1 (driver airbag), groundYes
4Ignition c irc uit 1 (drive r a irba g), connec te d to power
sourc eYes
5Ignition circuit 2 (passenger airbag), high resistance or
ope n c irc ui
tYes
6Ignition circuit 2 (passenger airbag), low resistance or
short c ircuitYes
7 Ignition circuit 2 (passenger airbag), groundYes
8Ignition circuit 2 (passenger airbag), connected to power
sourc eYes
9Ignition c irc uit 3 (drive r se a t belt pre tensione r), high
re sista nc e or ope n c irc uitYes
10Ignition c irc uit 3 (drive r se a t belt pre tensione r), low
resistance or short circui
tYes
11 Ignition c irc uit 3 (drive r se a t belt pre tensione r), groundYes
12Ignition c irc uit 3 (drive r se a t belt pre tensione r),
connec te d to power sourc eYes
13Ignition circuit 4 (passenger seat belt pretensioner), high
re sista nc e or ope n c irc uitYes
14Ignition circuit 4 (passenger seat belt pretensioner), low
resistance or short circui
tYes
15Ignition circuit 4 (passenger seat belt pretensioner),
groun
dYes
16Ignition circuit 4 (passenger seat belt pretensioner),
connec te d to power sourc eYes
17 High volta ge of powe r source Ye s
18 Low voltage of powe r sourc e Ye s
19Wa rning light trouble -c onne c te d to powe r sourc e or
short c ircuit of the light bulbYes
20 Wa rning light trouble -ground or fila me nt ope n c ircuit Ye s
21 Missing/mista ke of the algorithm parame te rs
No (replace SRS ECU (HAE2.5))
22 Previous crash recorde
dNo (replace SRS ECU (HAE2.5)) DTCs as re c ognize d by SRS ECU (HAE2.5)
246 The transmit of the DTCs are carried out in the way that the SRS ECU (HAE2.5) via serial data interface
of the maintenance procedures assign the codes to the diagnostic detector.23 C ommunication trouble Y e s
24 Inte rna l trouble (se e the follow ing ta ble )No (replace SRS ECU (HAE2.5))
25PADS (
passenger airbag deactivation
sw itch)
, connected to power source or open
circuitYes
26PADS (
passenger airbag deactivation
sw itch)
, ground or short c irc uitYes
27 PADS (passenger airbag switch), trouble Yes
28 C ra sh output pin, ground Y e s
29C ra sh output pin, short c irc uite d to pow e r
sourceYes
30PADI (passenger airbag deactivation switch
indic ator light) error, c onnected to pow er source
or light bulb short c irc uitYes
31PADI (passenger airbag deactivation switch
indic a tor light) e rror, ground or ope n c irc uitYes
32 Se a t be lt pre te nsione r se pa ra te ignition Y e s, up to 5 time s
33Se a t be lt pre te nsione r se pa ra te ignition for 6
time sNo (replace SRS ECU (HAE2.5))No. Trouble De sc ription DTC
1 Ignition c irc uit 1 (drive r a irba g), high re sistanc e or ope n circ uit B1 346
2 Ignition c irc uit 1 (drive r a irba g), low re sista nc e or short c irc uit B1 347
3 Ignition c irc uit 1 (drive r a irba g), groundB1 348
4 Ignition c irc uit 1 (drive r a irba g), c onne cte d to powe r sourc e B1 349
5 Ignition c irc uit 2 (pa sse nge r a irbag), high re sista nc e or ope n c ircuit B1 352
6 Ignition c irc uit 2 (pa sse nge r a irbag), low resista nce or short c irc uit B1 353
7 Ignition c irc uit 2 (pa sse nge r a irbag), groundB1 354
8 Ignition circuit 2 (passenger airbag), connected to power source B1 355
9 Ignition c irc uit 3 (drive r se a t belt pre te nsione r), high re sista nc e or ope n c ircuit B1 361
10 Ignition c irc uit 3 (drive r se a t belt pre te nsione r), low resista nce or short c irc uit B1 362
11 Ignition c irc uit 3 (drive r se a t belt pre te nsione r), ground B1 363
12 Ignition c irc uit 3 (drive r se a t belt pre te nsione r), c onne c t to power sourc e B1 364
13Ignition c ircuit 4 (passe nger se a t be lt pre tensione r), high re sista nc e or open
circuitB1 367 Diagnostic DTCs
247(2) Internal troubles
The micro controller can check the following items not
only in the initiation check but also in the circular diagnos-
tic check.
1Trigger transistor of ignition circuit: high-end transistor
can be checked not only in the initiation check but
also in the circular diagnostic check. However, since
the low-end transistor is open when connected in short
circuit to power source, it can only be checked in the
initiation check to avoid explosion.
2The ignition voltage is provided by supercharge
converter.
3The acceleration sensor performs selfcheck in the
initiation check.
4Range of allowed deviation of acceleration sensor in the circular diagnostic check.
5Microcontroller includes AD converter, ROM, RAM, etc.
6Status of safety sensor.NOTICE
The connectors of the squib circuit contain a
shorting bar. When the connector is not
connected, the unexpected deployment is
caused by the short in the circuit arising from
the contact of the positive (+) and negative (-)
terminals or the static electricity. If there is
poor connection for connectors, the symptom
may not be removed even when the shorting
bar is connected.14Ignition c irc uit 4 (passe nger se a t be lt pre tensione r), low re sistanc e
or short c irc uitB1 368
15 Ignition c ircuit 4 (passe nger se a t be lt pre tensione r), groundB1 369
16Ignition c ircuit 4 (passe nger se a t belt pre te nsione r), c onne c t topowe r sourceB1 370
17 High volta ge of powe r sourc e B1 111
18 Low volta ge of power sourc e B1 112
19Warning light trouble -c onne c te d to powe r sourc e or light bulb short
circuitB2 500
20 Warning light trouble -ground or filame nt ope n circ uitB2 500
21 Missing/mistake of the algorithm parameters B1 661
22 Previous crash recordedB1 650
23 Communic a tion trouble B1 407
23 Inte rna l trouble (se e the following ta ble) B1 620
24PADS(
pa ssenge r airba g de a ctiva tion switch)
, c onne c ted topowe r source or open c irc uitB1 527
25PADS(
passenger airbag deactivation switch)
, ground or short
circuitB1 528
26 PADS (passenger airbag deactivation switch), trouble B1 529
27 Cra sh output pin, groundB1 676
28 Cra sh output pin, short c irc uite d to power sourc e B1 677
29PADI (passenger airbag deactivation switch indicator light) error,
c onne c ted to powe r sourc e or light bulb short c irc uitB2 505
30PADI (passenger airbag deactivation switch indicator light) error,
ground or open c irc uitB2 505
31 Se a t be lt pre tensione r se pa ra te ignitionB1 657
32 Se a t be lt pre tensione r se pa ra te ignition for 6 time s B1 658
248An external watchdog can check the operation situation of the microcontroller. The failure of the microcontroller
can trigger the watchdog, which in turn can reset the microcontroller and turn on the warning light.No. List of Trouble s Trouble De sc ription
1 M ic r oc ont r olle r z AD c onve rte r or EEP ROM trouble (in
case of RAM and ROM failure, the
mic r oc ont r olle r w ill r e s e t a nd t he w a r ning
light will light up.) z Activate trouble z
Che ck the circ uit trouble z Activate trouble z Check the circuit trouble z Activate trouble z Chec k the c irc uit trouble z Activate trouble z Chec k the c irc uit trouble z Activate trouble z Check the circuit trouble z Activate trouble z Check the circuit trouble
6 Ignition volta ge z Low
7 Wa tchdog/rese t z Trouble
8 Maximum times of e xplosion of the se a t belt
pretensioner z 6
9 Ene rgy stora ge time (self-support time ) z Short z Ra nge of de via tion z Se nsor not in ste ady mode z Se nsor se lfc hec k trouble
11 Continuous abortion of ignition circ uit che c k z None xec ution of c irc ula r diagnostic test
(Repeated algorithm calculation) z Close for 2 or more tha n 2 sec onds z Sa fe ty se nsor is open c irc uit when
calculating the trouble with algorithm
13 Ignition c urre nt z All the ignition currents are normal
when the current SRS is deployed
14 No c onfirma tion of side SRS ignition z Eve n if the SRS ECU (HAE2.5) ha ve
received for 5 times the ignition information
during the HSIS ignition cyc le, the side SRS
a irba g ignition c a n not be ve rifie d by SRS
ECU (HAE2.5). Seat belt pretensioner ignition circuit (if realized)
5 P asse nger se a t be lt pre tensione r ignition c irc uit
(if realized) 2 P asse nger airba g ignition c ircuit
3 P asse nger airba g ignition c ircuit (if re a lize d)[Ta ble ] Inte rna l troubles pre dic te d by SRS ECU (HAE2.5)
10 Accelerometer
12 Sa fe ty se nsor6 Driver airbag ignition circuit (if realized)
7 P asse nger airba g ignition c ircuit (if re a lize d) 4
251Section 2 TroubleshootingI. LIST OF TROUBLES1. SRS warning light OFFDIAGNOSTIC PROCEDURESWhen performing the first diagnostic check, it is advised to shake slightly the harness and connector to see if
there is any discontinuous poor contact in circuit. If there is such a problem, make sure that the connections
of the connector, terminals and wire harness are correct and undamaged. Otherwise, follow these procedures:
(1) Check other wire harnesses and instrument cluster indicator lights
1Turn the ignition switch ON.
2Any other light on?
Yes: turn the ignition switch to LOCK, and continue with the next step.
No: check the power supply and ground system (fuse) of the instrument cluster, and continue with step 5.
(2) Check light bulb
CAUTION:
Mishandling of SRS components may release unexpectedly airbag and seat belt pretensioner, probably lead-
ing to a serious accident. Read the service cautions before handling a SRS component.
1Turn the ignition switch to LOCK.
2Disconnect the negative (-) terminal cable from the battery and wait for at least 60s.
3Remove the instrument cluster.
4Measure and see if the two pins of the SRS warning light is triggered.
Yes: continue with next step.
No: replace the bulb of the warning light.
Trouble Che c king Status P ossible Ca use
·Loss of voltage (fuse c irc uit bre a k)
·Instrument cluster trouble
·Trouble of wire harness between instrument
cluster and ECU SRS warning light OFF SRS wa rning c ircuit trouble1 SRS warning light is OFF SRS wa rning c irc uit trouble. No. Trouble shooting Ite ms De sc ription
2 SRS warning light re mains on SRS wa rning circ uit trouble or exte rna l trouble.