2001 SUZUKI GRAND VITARA Relay

5-2 BRAKES
Diagnosis
Diagnosis Table
For the item not found in this column, refer to the same item of the same section in the service manual men-
tioned in the FOREWORD of this manual.
Condition Possible Cause Correction
Brake warning light
turns on after engine
startParking brake applied Release parking brake and check
that brake warning light turns off.
Insufficient amount of brake fluid Add brake fluid.
Brake fluid leaking from brake line Investigate leaky point, correct it
and add brake fluid.
Brake warning light circuit faulty Repair circuit.
Malfunctioning EBD system Check system referring to “DIAG-
NOSIS” of Section 5E2.
ABS warning light
does not turn on for 2
– 3 sec. after ignition
switch has turned ON.Bulb burnt out Replace bulb.
ABS warning light circuit open (including check
relay)Check system referring to “DIAG-
NOSIS” in Section 5E2.
ABS warning light
remains on after igni-
tion switch has turned
on for 2 – 3 sec.Malfunctioning ABS Check system referring to “DIAG-
NOSIS” in Section 5E2.

5E2-2 ANTILOCK BRAKE SYSTEM (ABS)
Sensor Circuit or Sensor Ring ................. 5E2-22
DTC C1031 (DTC 31), DTC C1032
(DTC 32) – Right-Rear Wheel Speed
Sensor Circuit or Sensor Ring ................. 5E2-22
DTC C1035 (DTC 35), DTC C1036
(DTC 36) – Left-Rear Wheel Speed
Sensor Circuit or Sensor Ring ................. 5E2-22
DTC C1041 (DTC 41) – Right-Front Inlet
Solenoid Circuit ........................................ 5E2-24
DTC C1045 (DTC 45) – Left-Front Inlet
Solenoid Circuit ........................................ 5E2-24
DTC C1055 (DTC 55) – Rear Inlet
Solenoid Circuit ........................................ 5E2-24
DTC C1042 (DTC 42) – Right-Front
Outlet Solenoid Circuit ............................. 5E2-24
DTC C1046 (DTC 46) – Left-Front Outlet
Solenoid Circuit ........................................ 5E2-24
DTC C1056 (DTC 56) – Rear Outlet
Solenoid Circuit ........................................ 5E2-24
DTC C1057 (DTC 57) – Power Source Circuit....................................................... 5E2-25
DTC C1061 (DTC 61) – ABS Pump Motor
Circuit....................................................... 5E2-26
DTC C1063 (DTC 63) – ABS Fail-Safe
Relay Circuit ............................................ 5E2-27
DTC C1071 (DTC 71) – ABS Control
Module ..................................................... 5E2-28
On-Vehicle Service .................................... 5E2-29
Precautions .............................................. 5E2-29
ABS Hydraulic Unit Operation Check
(Using SUZUKI Scan Tool) ...................... 5E2-29
ABS Hydraulic Unit Operation Check
(Not Using Suzuki Scan Tool).................. 5E2-29
ABS Hydraulic Unit/Control Module
Assembly ................................................. 5E2-31
Rear Sensor Rotor (Retainer Ring) ......... 5E2-33
Tightening Torque Specification.............. 5E2-34
Special Tool ............................................... 5E2-34

ANTILOCK BRAKE SYSTEM (ABS) 5E2-3
General Description
Components/Parts Location
The ABS (Antilock Brake System) controls the fluid pressure applied to the wheel cylinder of each brake from
the master cylinder so that each wheel is not locked even when hard braking is applied.
This ABS has also the following function.
While braking is applied, but before ABS control becomes effective, braking force is distributed between the
front and rear so as to prevent the rear wheels from being locked too early for better stability of the vehicle.The
main component parts of this ABS include the following parts in addition to those of the conventional brake sys-
tem.
Wheel speed sensor which senses revolution speed of each wheel and outputs its signal.
ABS warning lamp which lights to inform abnormality when system fails to operate properly.
ABS hydraulic unit/control module assembly is incorporated ABS control module, ABS hydraulic unit (actua-
tor assembly), fail-safe relay and pump motor relay.
–ABS control module which sends operation signal to ABS hydraulic unit to control fluid pressure applied to
each wheel cylinder based on signal from each wheel speed sensor so as to prevent wheel from locking.
–ABS hydraulic unit which operates according to signal from ABS control module to control fluid pressure
applied to wheel cylinder of each 4 wheels.
–Fail-safe relay (solenoid valve) relay which supplies power to solenoid valve in ABS hydraulic unit and
pump motor relay.
–Pump motor relay which supplies power to pump motor in ABS hydraulic unit.
G sensor which detects body deceleration speed. (For 4WD model only)
This ABS is equipped with Electronic Brake force Distribution (EBD) system that controls a fluid pressure of rear
wheels to best condition, which is the same function as that of proportioning valve, by the signal from wheel sen-
sor independently of change of load due to load capacity and so on. And if the EBD system fails to operate prop-
erly, the brake warning lamp lights to inform abnormality.
1. Wheel speed sensor (Right-front) 6. Wheel speed sensor (Left-rear) 11. G sensor (For 4WD model only)
2. Stop lamp switch 7. Ground 12. Wheel speed sensor rotor (ring)
3. Data link connector 8. Diagnosis connector (Black connector) 13. 4WD switch (For 4WD model only)
4.“ABS” warning lamp 9. Wheel speed sensor (Left-front) 14. EBD warning lamp (Brake warning lamp)
5. Wheel speed sensor (Right-rear) 10. ABS hydraulic unit/control module assembly
(with ABS pump motor relay and fail-safe relay)
NOTE:
Above figure shows left-hand steering vehicle.
For right-hand steering vehicle, parts with (*) are installed at the side of symmetry.

5E2-4 ANTILOCK BRAKE SYSTEM (ABS)
ABS Hydraulic Unit/control Module Assembly
ABS control module is a component of ABS hydraulic unit/control
module assembly and has the following functions.
Self-diagnosis function
ABS control module diagnoses conditions of the system compo-
nent parts (whether or not there is any abnormality) all the time
and indicates the results (warning of abnormality occurrence and
DTC) through the ABS warning lamp as described below.
1) When ignition switch is turned ON, ABS warning lamp lights
for 2 seconds to check its bulb and circuit.
2) When no abnormality has been detected (the system is in
good condition), ABS warning lamp turns OFF after 2 sec-
onds.
3) When an abnormality in the system is detected, ABS warn-
ing lamp lights and the area where that abnormality lies is
stored in the memory of EEPROM in ABS control module.
4) When Diag. switch terminal (2) of diagnosis connector (1)
(monitor connector) is grounded, the abnormal area is output
as DTC. It is indicated by flashing of ABS warning lamp.
(Refer to the table below.)
5) For procedure to clear all DTC’s, refer to “DIAGNOSTIC
TROUBLE CODE CLEARANCE” in this section.
Also ABS control module turns ON EBD warning lamp (brake
warning lamp) depending on the trouble that detected by the
module and EBD warning lamp does not indicate DTC.
Fail-safe function
When an abnormality occurs (an abnormal DTC is detected),
ABS control module turns OFF the fail-safe relay which supplies
power to ABS hydraulic unit. Thus, with ABS not operating,
brakes function just like the brake system of the vehicle without
ABS.
SYSTEM CONDITIONABS WARNING LAMP
Diag. switch
terminal is
not groundedDiag. switch
terminal is
grounded
In good
condition
at presentNo trouble in the past OFF DTC 12
Trouble occurred in
the pastOFF History DTC
Abnormal-
ity exists
at presentNo trouble in the past ON Current DTC
Trouble occurred in
the pastONCurrent and
history DTCs
3. Ground terminal
4. Service wire

ANTILOCK BRAKE SYSTEM (ABS) 5E2-13
C1022 22 RF
Wheel speed sensor circuit
or sensor ring C1026 26 LF
C1032 32 RR
C1036 36 LR
C1041 41
RFInlet solenoid valve circuit
C1042 42 Outlet solenoid valve circuit
C1045 45
LFInlet solenoid valve circuit
C1046 46 Outlet solenoid valve circuit
C1055 55
REARInlet solenoid valve circuit
C1056 56 Outlet solenoid valve circuit
C1057 57 Power source
C1061 61 ABS pump motor and/or motor relay circuit
C1063 63 Fail safe-relay
C1071 71 ABS control moduleDTC
(displayed
on SUZUKI
scan tool)DTC
(indicated by
ABS warning
lamp)ABS warning lamp flashing
patternDIAGNOSTIC ITEMS

5E2-14 ANTILOCK BRAKE SYSTEM (ABS)
System Circuit
1. Battery 11. ABS fail-safe transistor (Solenoid valve transistor) 21. To ECM and SDM (if equipped)
2. Main fuses 12. ABS pump motor transistor 22. Stop lamp
3. Ignition switch 13. Pump motor 23. Stop lamp switch
4. Circuit fuses 14. Solenoid valves 24. G sensor (For 4WD vehicle only)
5. Combination meter 15. Diagnosis monitor coupler 25. 4WD lamp (For 4WD vehicle only)
6. ABS warning lamp 16. Right-rear wheel speed sensor 26. ECM (PCM) (For 4WD vehicle only)
7. Brake warning lamp (“EBD” warning lamp) 17. Left-rear wheel speed sensor 27. 4WD switch (For 4WD vehicle only)
8. Warning lamp driver module (for ABS) 18. Right-front wheel speed sensor 28. ECM (PCM)
9. ABS hydraulic unit/control module assembly 19. Left-front wheel speed sensor
10. Terminal arrangement of connector E136 for
ABS hydraulic unit/control module assembly20. Data link connector
TERMINAL CIRCUIT TERMINAL CIRCUIT
E1361 Idle up signal
E13614 ABS warning lamp
2 Stop lamp switch 15 Left-front wheel speed sensor (+)
3 Right-front wheel speed sensor (+) 16 Left-front wheel speed sensor (–)
4 Right-front wheel speed sensor (–) 17 4WD switch
5–18 Ignition switch
6 Right-rear wheel speed sensor (–) 19 Left-rear wheel speed sensor (+)
7 Right-rear wheel speed sensor (+) 20 Left-rear wheel speed sensor (–)
8–21 Data link connector
9–22 Ground (for ABS pump motor)
10 Brake warning lamp (EBD warning lamp) 23 ABS pump motor relay
11 G sensor (For 4WD vehicle only) 24 Ground (for ABS control module)
12 Diagnosis switch terminal 25 ABS fail-safe relay
13 Ground (For G sensor) (For 4WD vehicle only)

5E2-24 ANTILOCK BRAKE SYSTEM (ABS)
DTC C1041 (DTC 41) – Right-Front Inlet Solenoid Circuit
DTC C1045 (DTC 45) – Left-Front Inlet Solenoid Circuit
DTC C1055 (DTC 55) – Rear Inlet Solenoid Circuit
DTC C1042 (DTC 42) – Right-Front Outlet Solenoid Circuit
DTC C1046 (DTC 46) – Left-Front Outlet Solenoid Circuit
DTC C1056 (DTC 56) – Rear Outlet Solenoid Circuit
DESCRIPTION
The ABS control module monitors the output from the valve.
When the output of each valve exceeds the specified value compared with the signal sent from ABS control
module, this DTC is set.
INSPECTION
1. ABS hydraulic unit/control module assembly 3. ABS control module 5. Fail-safe relay
2. ABS hydraulic unit/control module assembly connector 4. Signal
Step Action Yes No
1 1) Check solenoid operation referring to item “ABS
HYDRAULIC UNIT OPERATION CHECK” in this
section.
Is it in good condition?Check terminal “E136-25”
connection. If connection is
OK, substitute a known-good
ABS hydraulic unit/control
module assembly and
recheck.Go to Step 2.
2 1) Ignition switch OFF.
2) Disconnect ABS hydraulic unit/control module con-
nector.
3) Check for proper connection to ABS hydraulic unit/
control module connector at terminal “E136-25”.
4) If OK, then measure voltage between terminal
“E19-25” of module connector and “E136-24”.
Is it 10 – 14 V?Substitute a known-good
ABS hydraulic unit/control
module assembly and
recheck.“WHT/BLU” or
“BLK” circuit
open.

5E2-26 ANTILOCK BRAKE SYSTEM (ABS)
DTC C1061 (DTC 61) – ABS Pump Motor Circuit
DESCRIPTION
The ABS control module monitors the voltage at monitor terminal of pump motor circuit constantly with the igni-
tion switch turned ON. It sets this DTC when the voltage at the monitor terminal does not become high/low
according to ON/OFF commands to the motor relay of the module (does not follow these commands).
INSPECTION
1. ABS hydraulic unit/control module assembly 3. ABS pump motor 5. ABS hydraulic unit/control module connector
2. ABS pump motor relay 4. ABS fail safe relay
Step Action Yes No
1 1) Check pump motor referring to “ABS
HYDRAULIC UNIT OPERATION CHECK”
in this section.
Is it in good condition?Check terminals “E136-
25” and “E136-23” con-
nection. If connections
OK, substitute a known-
good ABS hydraulic unit/
control module assembly
and recheck.Go to Step 2.
2 1) Ignition switch OFF.
2) Disconnect ABS hydraulic unit/control mod-
ule connector.
3) Check for proper connection to ABS
hydraulic unit/control module connector at
terminal “E136-23”.
4) If OK, then measure voltage between termi-
nal “E136-23” of module connector and
body ground.
Is it 10 – 14 V?Go to Step 3.“WHT/BLU” circuit open.
3 Measure resistance between terminal “E136-
22” of ABS hydraulic unit/control module con-
nector and body ground.
Is it infinite (∞)?“BLK” circuit open. Substitute a known-good
ABS hydraulic unit/con-
trol module assembly and
recheck.