Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 420

8B-65 Air Bag System:

NOTE
Upon completion of inspection and repair work, perform the following items.
• Reconnect all air bag system components and ensure all components are properly mounted.
• Clear DTCs referring to “DTC Clearance”, if any.
• Repeat “Air Bag Diagnostic System Check” to confirm that the trouble has been corrected.

1) With ignition switch OFF, disconnect special tools (A),

(B) and (C) or (D) and SDM connector “G47” or “L33”.

2) Release shorting bar in SDM connector inserting release

tool (1) included in special tool (A).

3) Measure voltage between “G47-7” and body ground,

“G47-8” and body ground (for DTC B1053) or “G47-1”
and body ground, “G47-2” and body ground (for DTC
B1057) [A], or between “L33-5” and body ground, “L33-
6” and body ground (for DTC B1053) or “L33-7” and
body ground, “L33-8” and body ground (for DTC B1057)
[B].

Special tool
(A): 09932–76010
(B): 09932–75010
(C): 09932–78310
(D): 09932–77320

With ignition switch ON, is voltage 4 V or less?

Substitute a known-
good SDM and recheck.

DTC B1054: “GRN/
ORN” circuit or “GRN/
YEL” circuit shorted to
power supply circuit.
(Between “G55” and
“G47” connectors or
between “L12” and
“L33” connectors)
DTC B1058: “BLU/
ORN” circuit or “BLU/
YEL” circuit shorted to
power supply circuit.
(Between “G55” and
“G47” connectors or
between “L36” and
“L33” connectors)

Step

Action

Yes

BASE OF COLUMN

PASSENGER INFLATOR

[A]

“L12”, “L36”

[B]

(C)

(B)

(A)

STEERING WHEEL

(A)

1, (A)

(A)

(B)

(D)

1, (A)

“G47-1”

“G47-2”

“G47-7” “G47-8”

“L33-8”

“L33-5”

“L33-6”

“L33-7”

“G55”

I5JB0A820043-01

Air Bag System: 8B-66

DTC B1073 / B1077: Driver / Passenger Forward-Sensor Circuit Short to Ground

S6JB0A8204027

Wiring Diagram

CAUTION

Be sure to observe instructions under CAUTION in “Air Bag Diagnostic System Check Flow”.

DTC Will Set when
Forward-sensor abnormal signal is detected by SDM.

Flow Test Description
Step 1: Check for short circuit between forward-sensor circuit and ground.
Step 2: Check if malfunction is in forward-sensor.

BLK

G47-20 GND

“G47”

RED

BLK/YEL

“G01”

G47-16

[A]

G47-19

G47-11

FP+

FP-

G47-17

G47-9

FD+

FD-

“G47”

ORN

PNK/BLK

ORN

PNK/BLK

“E77”

“G06”

“E24”

“E13”

PNK

PNK/BLU

PNK

PNK/BLU

BLK

G46-16 GND

“G46”

RED

BLK/YEL

“G01”

G46-11

[B]

L33-11

L33-12

FP+

FP-

L33-10

L33-9

FD+

FD-

ORN

PNK/BLK

ORN

PNK/BLK

“E79”

“L03”

“E24”

“E13”

PNK

PNK/BLU

PNK

PNK/BLU

“L33”

I5JB0A820049-01

[A]: Without side-air bag and curtain-air bag

3. “A/B” fuse

7. Passenger forward-sensor

[B]: With side-air bag and curtain-air bag

4. Junction block assembly

8. Ground for air bag system

1. From main fuse

5. SDM

2. Ignition switch

6. Forward-sensor

8B-67 Air Bag System:

DTC Troubleshooting

Step

Action

Yes

1) Turn ignition switch to OFF position.
2) Disconnect forward-sensor connector “E13” or “E24”.
3) Disconnect SDM connector “G47” or “L33”.
4) Check proper connection to SDM connector at terminals

“G47-9” and “G47-17” or “L33-9” and “L33-10” (for DTC
B1073) or terminals “G47-11” and “G47-19” or “L33-11”
and “L33-12” (for DTC B1077).

5) Measure resistance between “G47-9” and body ground,

“G47-17” and body ground (for DTC B1073) or “G47-11”
and body ground, “G47-19” and body ground (for DTC
B1077) [A], or between “L33-9” and body ground, “L33-
10” and body ground (for DTC B1073) or “L33-11” and
body ground, “L33-12” and body ground (for DTC
B1077) [B].

Special tool
(A): 09932–76010

Is each measured resistance infinity?

Go to Step 2.

For DTC B1073: “ORN”
circuit or “PNK/BLK”
circuit shorted to
ground.
For DTC B1077: “PNK”
circuit or “PNK/BLU”
circuit shorted to
ground.

1) Check forward-sensor referring to “Forward-Sensor

Inspection”.

Is it in good condition?

Substitute a known-
good SDM and recheck.

Replace forward-sensor
referring to “Forward-
Sensor Removal and
Installation”. If DTC still
exists, substitute a
known-good SDM and
recheck.

[A]

[B]

“G47-17”

“G47-9”

“G47-19” “G47-11”

“L33-10”

“L33-9”

“L33-11” “L33-12”

(A)

I5JB0A820050-02

Air Bag System: 8B-68

DTC B1074 / B1078: Driver / Passenger Forward-Sensor Circuit Short to Power Circuit or Open

S6JB0A8204028

Wiring Diagram
Refer to “DTC B1073 / B1077: Driver / Passenger Forward-Sensor Circuit Short to Ground”.

CAUTION

Be sure to observe instructions under CAUTION in “Air Bag Diagnostic System Check Flow”.

DTC Will Set when
Forward-sensor abnormal signal is detected by SDM.

Flow Test Description
Step 1: Check for open circuit in forward-sensor circuit.
Step 2: Check for short circuit between forward-sensor circuit and power supply circuit.
Step 3: Check if malfunction is in forward-sensor.

DTC Troubleshooting

Step

Action

Yes

“G47-9” and “G47-17” or “L33-9” and “L33-10” (for DTC
B1074), or terminals “G47-11” and “G47-19” or “L33-11”
and “L33-12” (for DTC B1078).

5) Check proper connection to forward-sensor connector at

terminals “E13-1” and “E13-2” or “E24-1” and “E24-2”.

6) Using service wire (1), connect “E13-1” and “E13-2”

terminal (for DTC B1074) or “E24-1” and “E24-2”
terminal (for DTC B1078) of forward-sensor connector.

7) Measure resistance between “G47-9” and “G47-17” (for

DTC B1074) or “G47-11” and “G47-19” (for DTC B1078)
[A], or between “L33-9” and “L33-10” (for DTC B1074) or
“L33-11” and “L33-12” (for DTC B1078) [B].

Special tool
(A): 09932–76010

Is each measured resistance 1

Ω

or less?

Go to Step 2.

For DTC B1074: High
resistance or open wire
in “ORN” circuit or
“PNK/BLK” circuit.
For DTC B1078: High
resistance or open wire
in “PNK” circuit or “PNK/
BLU” circuit.

“E13-1”, “E24-1”

“E13-2”, “E24-2”

[A]

[B]

“L33-12”

“L33-9” “L33-10” “L33-11”

“G47-9” “G47-17” “G47-19” “G47-11”

(A)

I5JB0A820051-01

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