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C Body Equipment > Airbag > Airbag SDM-33 (Temic) > Diagnostic Information and Procedures > Diagnostic Procedures > SDM (Airbag) (Convertible) > C-xx Fault Isolation Procedures > C-023 Front Impact Sensor Circuit

C-023 - Front Impact Sensor Circuit

Test

Work Order Description

Nominal Value

T001

Check: Diagnostic Trouble Code stored

Is the following Diagnostic Trouble Code stored?

B0083

Replace Left Or Middle EFS (Electronical Front Impact Sensor)

Diagnostic Tester Diagnostic Trouble Code Current Value:
Yes: No:
T002

Check: Diagnostic Trouble Code stored

Is the following Diagnostic Trouble Code stored?

B0083

Incorrect Left Or Middle EFS Installed (Electronical Front Impact Sensor)

Diagnostic Tester Diagnostic Trouble Code Current Value:
Yes: No:
T003

Check: Component

  • Check the following component for proper operation:
    B170 Sensor - Airbags, Front

Test okay?

Yes: No:
T004

Check: Short to Voltage of Signal Circuit

  • Important:
    Before working on the pyrotechnical system:
    Ignition off
    Disconnect and mask battery negative terminal
    Wait 1 min until the capacitor in the control unit has discharged.
  • Disconnect wiring harness connector from:
    A63 Control Unit - Airbag
    (Wiring Harness Connector XC18 )
    &
    B170 Sensor - Airbags, Front
  • Connect wiring harness connector to:
    G1 Battery
  • Ignition ON
  • Measure voltage between the following terminals:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 30 (XC18)
    &
    Ground

less than 0.3 V

Voltage Measurement Current Value: V
Yes: No:
T005

Check: Short to Voltage of Signal Circuit

  • Measure voltage between the following terminals:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 31 (XC18)
    &
    Ground

less than 0.3 V

Voltage Measurement Current Value: V
Yes: No:
T006

Check: Short to Ground of Signal Circuit

  • Ignition OFF
  • Measure resistance between the following terminals:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 31 (XC18)
    &
    Ground

greater than 500 kOhm

Resistance Measurement Current Value: kOhm
Yes: No:
T007

Check: Short to Ground of Signal Circuit

  • Measure resistance between the following terminals:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 30 (XC18)
    &
    Ground

greater than 500 kOhm

Resistance Measurement Current Value: kOhm
Yes: No:
T008

Check: Short Circuit in Wiring Harness

  • Measure resistance between the following terminals:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 30 (XC18)
    &
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 31 (XC18)

greater than 500 kOhm

Resistance Measurement Current Value: kOhm
Yes: No:
T009

Check: Interruption of Signal Circuit

  • Measure resistance between the following terminals:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 30 (XC18)
    &
    B170 Sensor - Airbags, Front
    Wiring harness connector (wiring harness side) terminal 1

less than 5 Ohm

Resistance Measurement Current Value: Ohm
Yes: No:
T010

Check: Interruption of Signal Circuit

  • Measure resistance between the following terminals:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 31 (XC18)
    &
    B170 Sensor - Airbags, Front
    Wiring harness connector (wiring harness side) terminal 2

less than 5 Ohm

Resistance Measurement Current Value: Ohm
Yes: No:


Result

Cause Of Fault

E001 Result: Defective Component
  • Defective component:
    B170 Sensor - Airbags, Front
E002 Result: Defective Component
  • Defective component:
    A63 Control Unit - Airbag
E003 Result: Defective Component
  • Defective component:
    B170 Sensor - Airbags, Front
    or
    A63 Control Unit - Airbag

Note:

The replacement of the components must be done in the listed order.

The system must be checked for proper operation after every replacement.

E004 Result: Interruption
  • Circuit interruption between:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 31 (XC18)
    &
    B170 Sensor - Airbags, Front
    Wiring harness connector (wiring harness side) terminal 2
E005 Result: Interruption
  • Circuit interruption between:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 30 (XC18)
    &
    B170 Sensor - Airbags, Front
    Wiring harness connector (wiring harness side) terminal 1
E006 Result: Short Circuit in Wiring Harness
  • Short circuit in wiring harness between:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 30 (XC18)
    &
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 31 (XC18)
E007 Result: Short to Ground
  • Short circuit to ground between:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 30 (XC18)
    &
    B170 Sensor - Airbags, Front
    Wiring harness connector (wiring harness side) terminal 1
E008 Result: Short to Ground
  • Short circuit to ground between:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 31 (XC18)
    &
    B170 Sensor - Airbags, Front
    Wiring harness connector (wiring harness side) terminal 2
E009 Result: Short to Voltage
  • Short circuit to voltage between:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 31 (XC18)
    &
    B170 Sensor - Airbags, Front
    Wiring harness connector (wiring harness side) terminal 2
E010 Result: Short to Voltage
  • Short circuit to voltage between:
    A63 Control Unit - Airbag
    Wiring harness connector (wiring harness side) terminal 30 (XC18)
    &
    B170 Sensor - Airbags, Front
    Wiring harness connector (wiring harness side) terminal 1





C Body Equipment > Airbag > Airbag SDM-33 (Temic) > Diagnostic Information and Procedures > Diagnostic Procedures > SDM (Airbag) (Convertible) > C-xx Fault Isolation Procedures > C-023 Front Impact Sensor Circuit

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