2003 SUZUKI GRAND VITARA Ac controller

YH4
GRAND
VITARA
1. 4WD switch
2. Transfer
3. Blank
4. Blank
5. ECM or PCM
6. Glove box7. Air pump assembly
8. Actuator
9. Axle lock clutch
10. Free axle hub
11. 4WD indicator lamp
7E-2 DIFFERENTIAL (FRONT)
4WD CONTROL SYSTEM
When the 4WD switch is turned ON by shifting the transfer shift lever, ECM (PCM) (G16 and J20 engine models)
or 4WD controller (H25 engine model) actuates (energizes) the air pump assembly. Then positive pressure is sent
from the air pump assembly to the actuator installed to the differential case and causes the axle lock clutch and
the free axle hub in the differential case to be engaged, resulting in the 4WD mode. Only when running in the 4WD
mode, front axles are joined to differential case, and they become free when 2WD mode is used (or when transfer
shift lever is shifted to N position), thereby reducing the power loss.

YH4
GRAND
VITARA
8D-4 WINDOWS, MIRRORS, SECURITY AND LOCKS
LH steering vehicleRH steering vehicle
Type 1
Type 2
Power Door Lock Controller (Canvas Top Model)
Power Door Lock SwitchBack Door Actuator
(except Canvas Top
Model)
Rear Door Actuator
Front Door Actuator
Fuse box
Power Door Lock and Keyless Entry (if equipped)
Controller (Hard Top Model)Keyless Entry Transmitter
(If keyless entry is equipped)
The illustration shows LH steering vehicle.
And RH steering vehicle is symmetrical.
POWER DOOR LOCK AND KEYLESS ENTRY (IF EQUIPPED) SYSTEM

YH4
GRAND
VITARA
8D-6 WINDOWS, MIRRORS, SECURITY AND LOCKS
POWER DOOR LOCK SYSTEM (IF KEYLESS ENTRY IS NOT EQUIPPED)
TroublePossible causeCorrection
All power doors are not
locked / unlocked by both
driver side door key
switch and power door
lock switch
ªDOOR LOCKº fuse blown (Hard Top
Model)
ªD / Lº fuse blown (Canvas Top Model)

Power door controller faulty

Wiring or grounding faultyReplace fuse to check for short
Replace controller
Repair
All power doors are not
locked / unlocked by only
power door lock switch
Power door lock switch faulty

Wiring or grounding faultyReplace switch
Repair
All power doors are not
locked / unlocked by only
driver side door key
switch
Driver side door key switch faulty

Wiring or grounding faultyReplace switch
Repair
Only one power door is not
locked / unlocked
Wiring or coupler faulty

Actuator (door lock motor) faultyRepair
Replace actuator

YH4
GRAND
VITARA
Terminal
Switch
Type 1
Type 2
1. Door lock switch
2. Door lock switch coupler
Terminal
Switch
8D-20 WINDOWS, MIRRORS, SECURITY AND LOCKS
POWER DOOR LOCK SYSTEM (IF KEYLESS
ENTRY IS NOT EQUIPPED)
INSPECTION
POWER DOOR LOCK SWITCH
Check for continuity between terminals at each switch position as
shown below.
Type 1
ALK
LOCK
NEUTRAL
UNLOCK
Type 2
ABF
LOCK
OFF
UNLOCK
POWER DOOR LOCK CONTROLLER (CANVAS TOP
MODEL)
1) Disconnect power door lock controller coupler.
2) Connect (+) wire and (±) wire of 12 V battery to terminal ªAº, ªEº
and ªFº as shown in figure.
3) Disconnect cord from terminal ªEº and connect it to terminal ªGº.
4) Repeat Steps 2) and 3) several times and if relay operation is
heard every time, it means that controller is operating.
POWER DOOR LOCK CONTROLLER (HARD TOP MODEL)
1) With the driver side door key turned LOCK, check all power
doors are locked.
2) With the driver side door key turned UNLOCK, check only the
driver side power door is unlocked.
Turn the driver side door key to UNLOCK again within 5 se-
conds, check all power doors are unlocked.
If check result of Step 1) and Step 2) is satisfactory, power door lock
controller is OK. If check result is not satisfactory, go to next Step 3).
3) Disconnect negative cable at battery.
4) Disconnect coupler of power door lock controller.
5) Use a 12 V battery to connect its (+) terminal to terminal E02-1,
and its (±) terminal to terminal E02-2 and E02-3. Check all power
doors are locked.
If check result is not satisfactory, repair circuit and recheck.
If check result is satisfactory, go to next Step 6).

YH4
GRAND
VITARA
Terminal
Key
WINDOWS, MIRRORS, SECURITY AND LOCKS 8D-21
6) Connect negative cable at battery.
7) Check that the voltage and resistance between following termi-
nals are specifications.
Terminals
ConditionSpecification
E02-7 and
groundAnytime10 ± 14 V
E02-14 and
groundAnytimecontinuity
E02-8 and
When driver side door key
switch is OFF positionNo continuity
groundWhen driver side door key
switch is LOCK positionContinuity
E02-9 and
When driver side door key
switch is OFF positionNo continuity
groundWhen driver side door key
switch is UNLOCK positionContinuity
If check result is not satisfactory, repair circuit and recheck.
If check result is satisfactory, replace controller.
KEY CYLINDER SWITCH (DRIVER SIDE)
Check for continuity between terminals according to the key action
shown below.
321
LOCK
OFF
UNLOCK

YH4
GRAND
VITARA
WINDOWS, MIRRORS, SECURITY AND LOCKS 8D-23
POWER DOOR LOCK AND KEYLESS ENTRY SYSTEM (IF KEYLESS ENTRY IS
EQUIPPED)
SYSTEM INSPECTION
STEPACTIONYESNO
1Check power door lock operation referring to its
INSPECTION in this section.
Is this operation OK?Go to Step 2.Go to Step 3.
2Check keyless entry operation referring to its
INSPECTION in this section.
Is this operation OK?Go to Step 4.Go to Step 6.
3Check keyless entry operation referring to its
INSPECTION in this section.
Is this operation OK?Go to Step 5.Go to Step 7.
4Check hazard warning lights operation referring to
its INSPECTION in this section.
Is this operation OK?This system is OK.Go to Step 10.
5Check door lock key and power door lock switch
circuit referring to its INSPECTION in this section.
Is this circuit OK?Replace controller and
recheck.
And go to Step 4.Repair circuit referring
to WIRING DIAGRAM
MANUAL and recheck.
And go to Step 4.
6Check ignition switch and door switch circuit
referring to its INSPECTION in this section.
Is this circuit OK?Replace controller and
recheck.
And go to Step 4.Repair circuit referring
to WIRING DIAGRAM
MANUAL and recheck.
And go to Step 4.
7Check power door lock actuator circuit referring to
its INSPECTION in this section.
Is this circuit OK?Go to Step 8.Repair circuit referring
to WIRING DIAGRAM
MANUAL and recheck.
If OK, go to Step 4.
If not OK, go to next
Step 8.
8Check power supply and grounding circuit
referring to its INSPECTION in this section.
Is this circuit OK?Go to Step 9.Repair circuit referring
to WIRING DIAGRAM
MANUAL and recheck.
If OK, go to Step 4.
If not OK, go to next
Step 9.
91) Check door lock key and power door lock
switch circuit referring to its INSPECTION in
this section.
2) Check ignition switch and door switch circuit
referring to its INSPECTION in this section.
Are these circuits OK?Replace controller and
recheck.
And go to Step 4.Repair circuit referring
to WIRING DIAGRAM
MANUAL and recheck.
And go to Step 4.

YH4
GRAND
VITARA
8D-24 WINDOWS, MIRRORS, SECURITY AND LOCKS
STEPACTIONYESNO
10Check that hazard warning lights flash with hazard
switch ON.
Is check result OK?Go to Step 11.Refer to ªTurn Signal
and Hazard Warning
Lightsº in DIAGNOSIS
and repair.
And go to Step 4.
11Check door knob switch and turn signal relay
circuit referring to its INSPECTION in this section.
Is this circuit OK?Replace controller and
recheck.Repair circuit referring
to WIRING DIAGRAM
MANUAL and recheck.
POWER DOOR LOCK OPERATION
INSPECTION
1) With the driver side door key turned LOCK, check all power
doors are locked.
2) With the driver side door key turned UNLOCK, check only the
driver side power door is unlocked.
Turn the driver side door key to UNLOCK again within 5 se-
conds, check all power doors are unlocked.
If check result of Step 1) and Step 2) is satisfactory, this operation
is OK.
KEYLESS ENTRY OPERATION
INSPECTION
1) With the IG switch OFF and all doors closed, push LOCK button
on transmitter. Check all power doors are locked.
2) Push UNLOCK button on transmitter. Check only driver side
power door is unlocked.
3) Push UNLOCK button on transmitter again within 5 seconds.
Check all power doors are unlocked.
But if any door is not opened within 30 seconds after power
door(s) unlocked, all power doors are locked again automatical-
ly.
If check result of Step 1) to Step 3) is satisfactory, this operation is
OK.
HAZARD WARNING LIGHTS OPERATION
INSPECTION
1) Check that hazard warning lights flash one time when power
doors are locked by pushing LOCK button on transmitter.
2) Check that hazard warning lights flash two times when power
door(s) is (are) unlocked by pushing UNLOCK button on trans-
mitter.
If check result of Step 1) and Step 2) is satisfactory, this operation
is OK.

YH4
GRAND
VITARA
0.5TIME (sec.) Ignition switch ON
High Immobilizer
control system
is normal
Immobilizer
control system
is abnormalLow
0.5 0.5 0.5 0.5
High
Low
0.5TIME (sec.) Ignition switch ON
High Immobilizer
control system
is normal
Immobilizer
control system
is abnormalLow
0.5 0.5 0.5 0.5
High
Low
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-5

With the diagnosis switch terminal of monitor coupler for
ECM / PCM not grounded, the ignition switch turned ON (but the en-
gine at stop) and regardless of the condition of the electronic fuel
injection system, ECM / PCM indicates whether a trouble has oc-
curred in the immobilizer control system or not by causing the mal-
function indicator lamp to flash or turn ON.
Malfunction indicator lamp is ON:
No trouble exists in the immobilizer control system.
Malfunction indicator lamp is flashing:
ECM / PCM or Immobilizer Control Module has detected some
trouble in the immobilizer control system.
NOTE:
As soon as the ignition switch is turned ON, ECM / PCM and Im-
mobilizer Control Module diagnose if a trouble has occurred
in the immobilizer control system. While the diagnosis is being
made, the malfunction indicator lamp stays ON and if the diag-
nosis result is ªabnormalº, it immediately changes to flashing
but if the result is ªnormalº, it remains ON. Diagnosis takes
about 3 seconds at maximum.

With the ignition switch turned ON (but the engine at stop) regard-
less of the condition of the electronic fuel injection system,
ECM / PCM indicates whether a trouble has occurred in the immobi-
lizer control system or not by causing the immobilizer indicator lamp
to flash or turn ON.
Immobilizer indicator lamp is ON:
No trouble exists in the immobilizer control system.
Immobilizer indicator lamp is flashing:
ECM / PCM or Immobilizer Control Module has detected some
trouble in the immobilizer control system.
NOTE:
As soon as the ignition switch is turned ON, ECM / PCM and Im-
mobilizer Control Module diagnose if a trouble has occurred
in the immobilizer control system. While the diagnosis is being
made, the Immobilizer indicator lamp stays ON and if the diag-
nosis result is ªabnormalº, it immediately changes to flashing
but if the result is ªnormalº, it remains ON. Diagnosis takes
about 3 seconds at maximum.
When ECM / PCM and Immobilizer Control Module detects a
trouble which has occurred in the above areas, it stores DTC corre-
sponding to the exact trouble area in ECM / PCM and Immobilizer
Control Module memory.
DTCs stored in memory of each controller (Immobilizer Control
Module and ECM / PCM) can be read by using the procedure de-
scribed in ªDIAGNOSTIC TROUBLE CODE CHECK (IMMOBILIZ-
ER CONTROL MODULE)º and ªDIAGNOSTIC TROUBLE CODE
CHECK (ECM / PCM)º in this section.