Lexus SC300 / Lexus SC400. Manual - part 45

SERVICE SPECIFICATIONS

SERVICE DATA

Idle speed                         Magnetic clutch no engaged
                                         Magnetic clutch engaged
Magnetic clutch clearance

Approx. 700 rpm
Approx. 700 rpm
0.5 

±

 0.15 mm                            0.020 

±

 0.006 in.

TORQUE SPECIFICATIONS

Part tightened

N

⋅

m

kgf

⋅

cm

ft

⋅

lbf

Suction hose X Compressor

25

250

18

Discharge hose X Compressor

25

250

18

Compressor X Engine

Bolt

49

500

36

Nut

29

300

22

Liquid tube X Receiver

10

  55

  7

Liquid tube X Condenser

10

100

  7

Discharge tube X Condenser

10

100

  7

Expansion valve X Evaporator

   5.4

  55

48 in.

⋅

lbf

Suction tube X A/C Unit

10

100

  7

Liquid tube X A/C Unit

10

100

  7

Equalizer tube X EPR

25

250

18

Pressure switch X Liquid tube

10

100

  7

–

AIR CONDITIONING SYSTEM

Service Specifications

AC–139

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Diag. Code 14

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Open in Squib Circuit

DIAGNOSTIC CHART

DIAGNOSTIC CHART

The squib circuit consists of the center airbag sensor assembly, spiral cable and the steering wheel pad
(squib). It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page 

AB–5

.

Diagnostic code 14 is recorded when an open is detected in the squib circuit.

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Code No.

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Diagnosis

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14

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Open circuit in D+ wire harness or D wire harness of squib.



 Squib malfunction.

 

Spiral cable malfunction.

 

Center airbag sensor assembly malfunction.

AB–62

–

SRS AIRBAG

Troubleshooting

Preperation.

Check squib circuit.

Check spiral cable.

Check harness between center airbag
sensor assembly and spiral cable.

Check center airbag sensor assembly.

Check squib.

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

Go to step

Repair or replace spiral cable.

Repair or replace harness or con-
nector between center airbag sen-
sor assembly and spiral cable.

Replace center airbag
sensor assembly

Replace steering wheel pad.

WIRING DIAGRAM

DIAGNOSTIC CHART

DIAGNOSTIC CHART

–

SRS AIRBAG

Troubleshooting

AB–63

INSPECTION PROCEDURE

(1) Disconnect battery negative (–) terminal cable, 

and wait at least 20 seconds.

(2) Remove steering wheel pad

(See page 

AB–14

).

Measure resistance between D+ and D– on spiral
cable side of connector between spiral cable and
steering wheel pad.

Preparation.

Resistance:    Below 1 

When storing steering wheel pad, keep upper sur-
face fo the pad facing upward.

Disconnect center airbag sensor assembly connec-
tor.

Check squib circuit.

Go to step

AB–64

–

SRS AIRBAG

Troubleshooting