Suzuki Grand Vitara JB416 / JB420. Manual — part 308

8B-28 Air Bag System:

DTC B1021: Air Bag Module Deployed

S5JB0A8204014

DTC Will Set when
The SDM detects a crash of sufficient force to warrant activation of the air bag system. (SDM outputs a deployment
command.)

Flow Test Description
Step 1: Check that DTC B1021 has been set although air bag has not been deployed.
Step 2: Check that DTC has been set due to failure of SDM.

NOTE
Before executing items in this flow, be sure to perform “Air Bag Diagnostic System Check”.

DTC Troubleshooting

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.
• Repeat “Air Bag Diagnostic System Check” to confirm that the trouble has been corrected.
• Clear DTCs of BCM referring to “DTC Clearance in Section 10B”

Step

Action

Yes

No

1

1) Turn ignition switch OFF.

Has air bag deployed?

Replace components
and perform inspections
as directed in “Repair
and Inspection
Required after
Accident”.

Go to Step 2.

2

1) Inspect front of vehicle and undercarriage for signs of

impact.

Are there signs of impact?

Replace components
and perform inspections
as directed in “Repair
and Inspection
Required after
Accident”.

Substitute a known-
good SDM and recheck.

Air Bag System: 8B-29

DTC B1031: Driver Air Bag Initiator Circuit Resistance High

S5JB0A8204018

Wiring Diagram

CAUTION

!

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

DTC Will Set when
The combined resistance of the driver air bag (inflator) module, contact coil assembly, harness wiring and connector
terminal contact is above a specified value for specified time.

Flow Test Description
Step 1: Check whether malfunction is in contact coil and driver air bag (inflator) module or the others.
Step 2: Check driver air bag (inflator) module initiator circuit.
Step 3: Check whether malfunction is in contact coil or driver air bag (inflator) module.

BLK

G47-20 GND

“G47”

1

2

4

3

RED

BLK

RED

BLK/YEL

“G01”

G47-16

IG

[A]

GRN/RED

GRN

GRN/RED

GRN

“Q01”

G47-5

G47-6

D1+

D1-

[D] “G27”

[C] “G26”

G46-16 GND

“G46”

G46-11

IG

[B]

G46-2

G46-1

D1+

D1-

“G47”

“G46”

[E]

8

5

5

6

7

I5JB0A820025-01

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

[E]: Shorting bar

4. Junction block assembly

8. Ground for air bag system

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

1. From main fuse

5. SDM

[C]: For vehicle without cruise control system

2. Ignition switch

6. Contact coil assembly

[D]: For vehicle with cruise control system

3. “A/B” fuse

7. Driver air bag (inflator) module

8B-30 Air Bag System:

DTC Troubleshooting

Step

Action

Yes

No

1

1) With ignition switch OFF, disconnect contact coil

connector located under of the steering column.

2) Check proper connection to contact coil at terminal in

“G26” or “G27” connector.

3) If OK, then connect special tools (B) and (C) to “G26”

connector (For vehicle without cruise control system [A])
or special tools (B) and (D) to “G27” connector (for
vehicle with cruise control system [B]) disconnected in
Step 1).

Special tool
(B): 09932–75010
(C): 09932–78340
(D): 09932–77320

4) Check SDM DTC.

With ignition switch ON, is DTC B1031 indicated?

Go to Step 2.

Go to Step 3.

(D)

“G27”

(B)

(C)

“G26”

BASE OF COLUMN

(B)

BASE OF COLUMN

[A]

[B]

DRIVER

PASSENGER

I5JB0A820026-02

Air Bag System: 8B-31

2

1) With ignition switch OFF, disconnect SDM connector

“G47” or “G46”.

2) Check proper connection to SDM at terminals “G47-5”

and “G47-6” or “G46-1” and “G46-2”.

3) If OK, release shorting bar in SDM connector inserting

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

4) Measure resistance between “G47-5” and “G47-6”

terminals [A] or between “G46-1” and “G46-2” terminals
[B] with connected special tools (B) and (C) (for vehicle
without cruise control system [C]) or special tools (B)
and (D) (for vehicle with cruise control system [D]).

Special tool
(A): 09932–76010
(B): 09932–75010
(C): 09932–78340
(D): 09932–77320

Is resistance 5.5

Ω

or less?

Substitute a known-
good SDM and recheck.

High resistance or open
wire in “GRN/RED” or
“GRN” circuit.

Step

Action

Yes

No

[C]

[D]

[A]

[B]

“G47-6”

“G46-2”

“G47-5”

“G46-1”

1, (A)

(A)

1, (A)

(D)

“G27”

(B)

(C)

“G26”

BASE OF COLUMN

(B)

BASE OF COLUMN

DRIVER

PASSENGER

I5JB0A820027-02