Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 68

4F-26 Electronic Stability Program: 

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

1. Battery

5. Stop lamp

2. Main fuse box

6. ECM

DTC Detecting Condition

Trouble Area

Vehicle behavior and stop lamp switch signal is disagreed 
for specified time.

• Back up light switch circuit
• Back up light switch
• ECM
• ESP

® control module

Step

Action

Yes

No

1

Was “Electronic Stability Program Check” performed?

Go to Step 2.

Go to “Electronic 
Stability Program 
Check”.

2

DTC check for ESP

®

1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Turn ignition switch ON and check DTC for ESP

®.

Is DTC U1073 and/or U1100 detected?

Go to applicable DTC 
diag. flow.

Go to Step 3.

3

Check stop lamp switch
1) Check stop lamp (brake pedal) switch referring to “Stop 

(Brake) Lamp Switch Inspection in Section 9B in related 
manual”.

Is it in good condition?

Go to Step 4.

Replace stop lamp 
switch.

4

Check stop lamp switch circuit
1) Disconnect connector from stop lamp switch connector 

with ignition switch turned OFF.

2) Check for proper connection to switch connector.
3) If connection are OK, measure voltage between “GRN” 

wire terminal of stop lamp switch connector and vehicle 
body ground.

Is it 10 – 14 V?

Go to Step 5.

Replace fuse and/or 
repair “GRN” wire 
circuit.

5

Check stop lamp switch circuit
1) Disconnect connectors from ECM.
2) Check for proper connection to “E23-20” wire of ECM 

connector.

3) If connections are OK, check stop lamp switch circuit for 

the following.
• Resistance of “GRN/WHT” wire terminal of stop lamp 

switch between stop lamp switch connector and ECM 
connector is less than 1

Ω (continuity check)

• Resistance between “GRN/WHT” wire terminal of stop 

lamp switch connector and vehicle body ground is 
infinity (ground short check)

• Voltage of between “GRN/WHT” wire terminal of stop 

switch connector and vehicle body ground is 0 V with 
ignition switch tuned ON (power short check)

Is it in good condition?

Substitute a known-
good ECM and recheck. 
If DTC C1016 is still 
detected, substitute a 
known-good ESP

® 

hydraulic unit / control 
module assembly and 
recheck.

Repair or replace 
defective wire.

Electronic Stability Program:  4F-27

DTC C1018: Brake Fluid Level Switch Failure

S5JB0E4604027

Wiring Diagram

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

[A]

E53

16

1

15

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

RED/BLK

E53-13
E53-44

RED

WHT

RED

WHT

12V

1

2

3

4

5

6

2

G31-1
G31-3

G31-7

G31

1

2

3

4

7

8

9

10

11

14

15

16
36

34

35

24 23

21

22

28 27

25

26

37

39 38

40

18 17

13 12

19

20

[B]

I6JB01460017-02

[A]: ESP

® control module connector (viewed from terminal side)

2. CAN driver

5. Brake fluid level switch

[B]: BCM connector (viewed from harness side)

3. Junction connector

6. ESP

® hydraulic unit control module assembly

1. BCM

4. To TCM, 4WD control module, keyless 

start control module, combination 
meter and steering angle sensor

DTC Detecting Condition

Trouble Area

• Brake fluid level is too low.
• Input voltage of brake fluid level switch to BCM is low.

• Brake fluid level
• Brake fluid level switch circuit
• Brake fluid level switch
• BCM
• ESP

® control module

Step

Action

Yes

No

1

Was “Electronic Stability Program Check” performed?

Go to Step 2.

Go to “Electronic 
Stability Program 
Check”.

2

Check brake fluid level
1) Check brake fluid level in reservoir.

Is brake fluid level upper than the minimum level?

Go to Step 3.

Replenish brake fluid to 
reservoir.

3

DTC check for ESP

®

1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Turn ignition switch ON and check DTC for ESP

®.

Is DTC U1073 and/or U1140 detected?

Go to applicable DTC 
diag. flow.

Go to Step 3.

4

Check brake fluid level switch
1) Turn ignition switch to OFF position.
2) Disconnect brake fluid level switch connector.
3) Check for proper connection at each terminal of brake 

fluid level switch connector.

4) If OK, then check brake fluid level switch referring to 

“Brake Fluid Level Switch Inspection in Section 9C in 
related manual”.

Is check result OK?

Go to Step 5.

Replace brake fluid 
level switch.

4F-28 Electronic Stability Program: 

DTC 1020: Master Cylinder Pressure Sensor Power Supply Failure

S5JB0E4604028

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

1) Turn ignition switch to OFF position.
2) Check for proper connection from harness to ESP

® control module.

3) If OK, substitute an ESP

® hydraulic unit / control module assembly with correct part number.

4) Recheck system.

DTC C1021, C1022 / C1025, C1026 / C1031, C1032 / C1035, C1036: Right-Front / Left-Front / Right-
Rear / Left-Rear Wheel Speed Sensor Circuit or Encoder Failure

S5JB0E4604014

Refer to “DTC C1021, C1022 / C1025, C1026 / C1031, C1032 / C1035, C1036: Right-Front / Left-Front / Right-Rear / 
Left-Rear Wheel Speed Sensor Circuit or Encoder Failure in Section 4E”.

5

Check brake fluid level switch circuit
1) Disconnect BCM connector.
2) Check for proper connection to BCM connector at “G31-

7” terminal.

3) If OK, then check resistance between “G31-7” terminal 

and vehicle body ground.

Is resistance infinity?

Go to Step 6.

“BLKL/RED” wire circuit 
is shorted to ground.

6

Check BCM
1) Connect brake fluid level switch connector and BCM 

connector.

2) Check voltage at “G31-7” terminal of BCM referring to 

“Inspection of BCM and its Circuits in Section 10B in 
related manual”.

Is voltage in good condition?

Substitute a known-
good ESP

® hydraulic 

unit / control module 
assembly and recheck.

Check BCM power and 
ground circuit. If circuit 
is OK, substitute a 
known-good BCM and 
recheck.

Step

Action

Yes

No

DTC Detecting Condition

Trouble Area

Power supply voltage to master cylinder pressure sensor 
in ESP

® hydraulic unit / control module assembly is too 

low.

• ESP

® control module

Electronic Stability Program:  4F-29

DTC C1024: Steering Angle Sensor Circuit Failure

S5JB0E4604029

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC C1027: ESP

® OFF Switch Circuit Failure

S5JB0E4604030

Wiring Diagram

DTC Detecting Condition and Trouble Area

DTC Detecting Condition

Trouble Area

• Steering angle sensor internal defect is detected by 

CPU in steering angle sensor.

• Steering angle sensor signal is out of specified range.

• Steering angle sensor
• ESP

® control module

Step

Action

Yes

No

1

Was “Electronic Stability Program Check” performed?

Go to Step 2.

Go to “Electronic 
Stability Program 
Check”.

2

DTC check for ESP

®

1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Turn ignition switch ON and check DTC for ESP

®.

Are DTC C1037, U1073 and/or U1126 detected?

Go to applicable DTC 
diag. flow.

Go to Step 3.

3

Check sensor calibration
1) Calibrate steering angle sensor referring to “Sensor 

Calibration”.

2) Clear all DTC(s) and check DTC for ESP

®.

Is DTC C1024 still detected?

Go to Step 4.

Steering angle sensor 
calibration was 
incompleted.

4

Check steering angle sensor
1) Check steering angle sensor referring to “Steering Angle 

Sensor On-Vehicle Inspection”.

Is it good condition?

Substitute a known-
good ESP

® hydraulic 

unit / control module 
assembly and recheck.

Replace steering angle 
sensor.

[A]

E53

16

1

15

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

BLU/WHT

BLK

12V

E53-7

1

2

I6JB01460018-01

[A]: ESP

® control module connector (viewed from terminal side)

1. ESP

® OFF Switch

2. ESP

® hydraulic unit control module assembly

DTC Detecting Condition

Trouble Area

Mechanical switch failure, failure in switch wiring is 
shorted to ground.

• ESP

® OFF switch

• ESP

® OFF switch circuit

• ESP

® control module