Lexus RX300 (MCU15). Service manual - part 273

H01002
H02144 AB0119

W02044

H10600

H10602

D Squib

Spiral
Cable

Airbag
Sensor
Assembly

ON

DTC B0101/14

DLC3

→ ←

D+

D–

Tc

CG

DI–324

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

3

Check airbag sensor assembly.

PREPARATION:
(a)

Connect the connector to the airbag sensor assembly.

(b)

Using a service wire, connect D+ and D– of the connector
(on the spiral cable side) between the spiral cable and the
steering wheel pad.

(c)

Connect negative (–) terminal cable to the battery, and
wait at least for 2 seconds.

CHECK:
(a)

Turn the ignition switch to ON, and wait at least for 20 se-
conds.

(b)

Clear the DTC stored in memory (See page DI–305).

(c)

Turn the ignition switch to LOCK, and wait at least for 20
seconds.

(d)

Turn the ignition switch to ON, and wait at least for 20 se-
conds.

(e)

Check the DTC (See page DI–305).

OK:

DTC B0101/14 is not output.

HINT:
Codes other than code B0101/14 may be output at this time, but
they are not relevant to this check.

NG

Replace airbag sensor assembly.

OK

W02044

H01003

AB0119
H10600

H10603

→ ←

D Squib

Spiral
Cable

ON

DTC B0101/14

DLC3

Tc

CG

Airbag
Sensor
Assembly

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–325

LEXUS RX300   (RM785E)

4

Check D squib.

PREPARATION:
(a)

Turn the ignition switch to LOCK.

(b)

Disconnect negative (–) terminal cable from the battery,
and wait at least for 90 seconds.

(c)

Connect the steering wheel pad connector.

(d)

Connect negative (–) terminal cable to the battery, and
wait at least for 2 seconds.

CHECK:
(a)

Turn the ignition switch to ON, and wait at least for 20 se-
conds.

(b)

Clear the DTC stored in memory (See page DI–305).

(c)

Turn the ignition switch to LOCK, and wait at least for 20
seconds.

(d)

Turn the ignition switch to ON, and wait at least for 20 se-
conds.

(e)

Check the DTC (See page DI–305).

OK:

DTC B0101/14 is not output.

HINT:
Codes other than code B0101/14 may be output at this time, but
they are not relevant to this check.

NG

Replace steering wheel pad.

OK

From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

H01000

H02142

H02195

D Squib

← →

Spiral 
Cable

D+

(–)

(+)

D–

Airbag 

Sensor 

Assembly

H01004

R14286

H01143

D Squib

Spiral
Cable

Airbag

Sensor

Assembly

D+

(–)

(+)

D–

DI–326

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

5

Check spiral cable.

PREPARATION:
Disconnect the connector between the airbag sensor assembly
and the spiral cable.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and the steering wheel pad, measure the resistance be-
tween D+ and D–.
OK:

Resistance: Below 1 Ω

NG

Repair or replace spiral cable.

OK

6

Check harness between airbag sensor assembly and spiral cable.

CHECK:
For the connector (on the spiral cable side) between the airbag
sensor assembly and the spiral cable, measure the resistance
between D+ and D–.
OK:

Resistance: Below 1 Ω

NG

Repair or replace harness or connector be-
tween airbag sensor assembly and spiral cable.

OK

From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

H01001

H02145

H02198

D Squib

Spiral 
Cable

Airbag 

Sensor 

Assembly

D+

(–)

(+)

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–327

LEXUS RX300   (RM785E)

DTC

B0102/11

Short in D Squib Circuit (to Ground)

CIRCUIT DESCRIPTION

The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad. 
It causes the SRS to deploy when the SRS deployment conditions are satisfied. 
For details of the function of each component, see OPERATION on page RS–2. 
DTC B0102/11 is recorded when a ground short is detected in the D squib circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0102/11

S Short circuit in D squib wire harness (to ground)

S D squib malfunction

S Spiral cable malfunction

S Airbag sensor assembly malfunction

S Steering wheel pad (D squib)

S Spiral cable

S Airbag sensor assembly

S Wire harness

WIRING DIAGRAM

See page DI–318.

INSPECTION PROCEDURE

1

Prepare for inspection (See step 1 on page DI–431).

2

Check D squib circuit.

CHECK:
For the connector (on the spiral cable side) between the spiral
cable and the steering wheel pad, measure the resistance be-
tween D+ and body ground.
OK:

Resistance: 1 MΩ or Higher

NG

Go to step 5.

OK

DI6P5–01