Suzuki Grand Vitara JB627. Manual — part 412

10A-14 Cruise Control System:

DTC Troubleshooting

NOTE
Before this trouble shooting, read and observe “Precautions for DTC Troubleshooting in Section 1A”.

Step

Action

Yes

No

1

Brake light switch check
1) Check brake light switch referring to “Brake Light Switch

Inspection in Section 9B”.

Is it in good condition?

Go to Step 2.

Replace brake light
switch.

2

Brake light switch power circuit check
1) Disconnect connector from brake light switch connector

with ignition switch turned OFF.

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

“BLU/BLK” wire terminal and “GRN” wire terminal of
brake light switch connector and vehicle body ground
with ignition switch tuned ON.

Is each measured voltage 10 – 14 V?

Go to Step 3.

Check related fuse and
repair defective circuit.

3

Brake light switch signal circuit check
1) Disconnect connectors from ECM with ignition switch

turned OFF.

2) Check for proper connection of each switch circuit

terminal to ECM connector.

3) If connections are OK, check brake light switch circuit for

the following.
• Resistance of each “YEL/GRN” wire terminal and

“GRN/WHT” wire terminal of brake light switch
between brake light switch connector and ECM
connector is less than 1

Ω (continuity check)

• Resistance between “YEL/GRN” wire terminal and

“GRN/WHT” wire terminal of brake light switch
connector are infinity (no continuity check)

• Resistance between each “YEL/GRN” wire terminal

and “GRN/WHT” wire terminal of brake light switch
connector and vehicle body ground is infinity (ground
short check)

• Voltage of between each “YEL/GRN” wire terminal

and “GRN/WHT” wire terminal of brake light 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.

Repair or replace
defective wire.

Cruise Control System: 10A-15

Inspection of Cruise Control System Circuit

S6JB0BA104012

Cruise control system is controlled by ECM. Each switch and circuit can be checked by taking measurement of
terminal voltage and terminal to terminal resistance of ECM. When measuring these values, be sure to read
precautions for measurement described under “Inspection of ECM and Its Circuits in Section 1A”.

Voltage Check
Check voltage between the following terminals with ECM connector connected.

Terminal arrangement of ECM connector viewed from harness side

1

3 2

4

5

6

7

8

9

1110

12

13

14

15

16

17

18

19

20

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

33

34

35

36

37

38

39

40

32

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

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

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

C37

E23

I6JB01A10007-01

Terminals

Circuit

Normal Voltage

Condition

E23-30 – ground Brake light switch circuit

0 V

Ignition switch is at ON position and brake
pedal is not depressed.

10 – 14 V

Ignition switch is at ON position and brake
pedal is depressed.

E23-31 – ground

Cruise control MAIN (ON/
OFF) switch circuit

0 V

Ignition switch is at ON position and cruise
control MAIN (ON/OFF) switch is not pushed.

10 – 14 V

Ignition switch is at ON position and cruise
control MAIN (ON/OFF) switch is kept in push.

E23-32 – ground

Brake pedal position switch
circuit

10 – 14 V

Ignition switch is at ON position and brake
pedal is not depressed.

0 V

Ignition switch is at ON position and brake
pedal is depressed.

E23-38 – ground

Ground circuit for cruise
control command switch

Below 1.3 V

Ignition switch is at ON position.

E23-39 – ground

Cruise control command
switch (SET/COAST, ACC/
RES and CANCEL switch)
circuit

0 – 0.1 V

Ignition switch is at ON position and cruise
control CANCEL switch is kept in push.

1.5 – 1.9 V

Ignition switch is at ON position and SET/
COAST switch of cruise control is kept in push.

3.2 – 3.7 V

Ignition switch is at ON position and ACC/RES
switch of cruise control is kept in push.

4.5 – 5.5 V

Ignition switch is at ON position and cruise
control command switches are not pushed.

E23-40 – ground CPP switch circuit

10 – 14 V

Ignition switch is at ON position and clutch
pedal is not depressed.

0 V

Ignition switch is at ON position and clutch
pedal is depressed.

10A-16 Cruise Control System:

Repair Instructions

Cruise Control Switch Removal and Installation

S6JB0BA106001

For removal and installation, refer to “Remote Audio
Control Switch Removal and Installation (If Equipped) in
Section 9C”.

Cruise Control Switch Inspection

S6JB0BA106002

NOTE
Never disassemble cruise control switch.
Disassembly will spoil its original functions.

1) Remove driver air bag (inflator) module referring to

“Driver Air Bag (Inflator) Module Removal and
Installation in Section 8B”.

2) Disconnect cruise control switch connector (1) from

control coil.

3) Check cruise control switch as follow.

For MAIN (ON/OFF) Switch
Check for continuity between “1” and “8” terminals under
each condition below.
If check result is not satisfactory, replace cruise control
switch (2).

Cruise MAIN (ON/OFF) switch (3) specification: [B]
Switch button released: Infinity
Switch button pressed: Continuity

For SET/COAST, RES/ACC and CANCEL Switch
Check for resistance between “7” and “9” terminals
under each condition below.
If check result is not satisfactory, replace cruise control
switch (2).

SET/COAST, RES/ACC and CANCEL switches
resistance: [C]
All switches released (OFF): Infinity
CANCEL switch (4) pressed (ON): About 0

Ω

SET/COAST switch (5) pressed (ON): 209 – 231

Ω

RES/ACC switch (6) pressed (ON): 864 – 956

Ω

CPP Switch (for Cruise Control) Removal and
Installation

S6JB0BA106003

Removal

1) Disconnect connector of CPP switch (for cruise

control) (1) with ignition switch OFF.

2) Remove CPP switch (for cruise control) (1) from

pedal bracket.

[A]: Cruise control switch connector viewed from harness side

2. Brake light switch

1

5

3

6

7 8 9

1

5

3

6

7 8 9

[B]

[C]

[A]

6

1

4

5

2

3

I6JB0BA10004-01

1

2

I5JB0AA10007-01

Cruise Control System: 10A-17

Installation

1) Install CPP switch (for cruise control) (2) to pedal

bracket.

2) With clutch pedal (1) released, adjust switch position

so that clearance between end of thread and clutch
pedal bracket is within specification.

Clearance between end of thread and clutch
pedal bracket
“a”: 0.5 – 1.5 mm (0.02 – 0.06 in.) (LHD)
“a”: 2.0 – 3.0 mm (0.079 – 0.118 in.) (RHD)

3) Tighten lock nut (3) to specified torque.

Tightening torque
CPP switch lock nut: 7.5 N·m (0.75 kgf-m, 5.5 lb-
ft)

4) Connect connector to CPP switch (for cruise control)

(2) securely.

Clutch Pedal Position (CPP) Switch (for Cruise
Control) Inspection and Adjustment

S6JB0BA106004

Inspection
Check for resistance between terminals under each
condition below. If check result is not satisfactory,
replace.

CPP switch (for cruise control) resistance
When switch shaft is pushed [A]: No continuity
When switch shaft is free [B]: Continuity

Adjustment
For adjustment, refer to “Installation” under “CPP Switch
(for Cruise Control) Removal and Installation”.

Brake Light Switch Removal and Installation

S6JB0BA106005

For removal and installation, refer to “Brake Light Switch
Adjustment in Section 4A”.

Brake Light Switch Inspection

S6JB0BA106006

Check for continuity between terminals referring to
“Brake Light Switch Inspection in Section 9B”.

ECM Removal and Installation

S6JB0BA106007

For removal and installation, refer to “Engine Control
Module (ECM) Removal and Installation in Section 1C”.

Specifications

Tightening Torque Specifications

S6JB0BA107001

Reference:
For the tightening torque of fastener not specified in this section, refer to “Fastener Information in Section 0A”.

“a”

2

1

3

I5JB0AA10008-01

I5JB0AA10009-01

Fastening part

Tightening torque

Note

N

⋅m

kgf-m

lb-ft

CPP switch lock nut

7.5

0.75

5.5

)