Lexus RX300 (MCU15). Manual - part 271

DI–316

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

No.

Symbol

Terminal Name

A27 – 12

ESL

Side Airbag Sensor (LH)

A29 – 1

SFR+

Squib (Side, RH)

A29 – 2

SFR–

Squib (Side, RH)

A29 – 5

PR+

Squib (Pretensioner,  RH)

A29 – 6

PR–

Squib (Pretensioner,  RH)

A29 – 7

ESR

Side Airbag Sensor (RH)

A29 – 9

FSR

Side Airbag Sensor (RH)

A29 – 10

SSR+

Side Airbag Sensor (RH)

A29 – 12

VUPR

Side Airbag Sensor (RH)

DI6P2–05

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–317

LEXUS RX300   (RM785E)

PROBLEM SYMPTOMS TABLE

Proceed with troubleshooting of each circuit in the table below.

Symptom

Suspect Area

See page

S With the ignition switch in ON position, the SRS warning light

sometimes lights up after approx. 6 seconds have elapsed.

S SRS warning light is always lit up even when ignition switch is in

the LOCK position.

S SRS warning light circuit

DI–434

S With the ignition switch in ON position, the SRS warning light

does not light up.

S DTC is not displayed.

S SRS warning light is always lit up at the time of DTC check pro-

cedure.

S Tc terminal circuit

DI–439

S DTC is displayed without Tc and CG terminal connection.

DI6P3–07

H01451

Y–B

D+

A28

14

Airbag Sensor Assembly

13

A28 D–

Y

1

2

Spiral
Cable

D Squib

DI–318

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

CIRCUIT INSPECTION

DTC

B0100/13

Short in D Squib Circuit

CIRCUIT DESCRIPTION

The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad. 
It causes the airbag to deploy when the airbag deployment conditions are satisfied. 
For details of the function of each component, see OPERATION on page RS–2. 
DTC B0100/13 is recorded when a short is detected in the D squib circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0100/13

S Short circuit between D+ wire harness and D– wire har-

ness of squib

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

H01001
H02142

H02193

D Squib

Spiral 
Cable

Airbag 

Sensor 

Assembly

D+

(–)

(+)

D–

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–319

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

1

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

2

Check D squib circuit.

PREPARATION:
Release the airbag activation prevention mechanism of the
connector (on the airbag sensor assembly side) between the
airbag sensor assembly and the spiral cable (See page 
DI–305).
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: 1 MΩ or Higher

NG

Go to step 5.

OK