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Suzuki Grand Vitara JB627. Manual - part 310

8B-66 Air Bag System:

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

S6JB0B8204027

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

Air Bag System: 8B-67

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.
• Clear DTCs referring to “DTC Clearance”, if any.
• Repeat “Air Bag Diagnostic System Check” to confirm that the trouble has been corrected.

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

8B-68 Air Bag System:

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

S6JB0B8204028

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

Air Bag System: 8B-69

1) Disconnect service wire from “E13” or “E24” connector.
2) Measure voltage between “G47-9” and body ground,

“G47-17” and body ground (for DTC B1074) or “G47-11”
and body ground, “G47-19” and body ground (for DTC
B1078) [A], or between “L33-9” and body ground, “L33-
10” and body ground (for DTC B1074) or “L33-11” and
body ground, “L33-12” and body ground (for DTC
B1078) [B].

Special tool
(A): 09932–76010

With ignition switch ON, is each measured value 1 V or less?

Go to Step 3.

For DTC B1074: “ORN”
circuit or “PNK/BLK”
circuit shorted to power
circuit.
For DTC B1078: “PNK”
circuit or “PNK/BLU”
circuit shorted to power
circuit.

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.

Step

Action

Yes

(A)

[A]

[B]

“G47-11”

“G47-9” “G47-17” “G47-19 ”

“L33-9”

“L33-10”

“L33-11” “L33-12”

I5JB0A820052-01

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