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No.
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TECH 1 Display
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Conditions for Checking
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Nominal Value
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Trouble Codes
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Terminal
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|
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03
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SQUIB CO-DRIVER
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Ignition ON
Note:
The measurement value displayed on TECH 1 has
only a relative significance, i.e. it serves only to recognize changes in
resistance in the ignition circuit, e.g. due to a loose contact.
Usually a value greater than 0 % but less than
100 % is displayed. A value greater than 200 % indicates an open electrical
circuit.
|
less than 100 %
Value should be approx. constant; there should
be no larger fluctuations
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21, 22, 33, 34
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5, 6
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|
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Trouble-shooting:
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Nominal Value:
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Cause of Fault:
(If
nominal value is not attained)
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|
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For checking operations, observe the safety
regulations detailed in section 1.1 of these Checking Procedures.
The
vehicle battery must always be disconnected except when the checking
operations include voltage measurement.
|
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· Ignition
OFF
· Disconnect
battery
· Disconnect
contact unit/
wiring harness plug X 91
(observe safety measures)
· Disconnect
co-driver airbag unit
wiring harness plug X 93
· Disconnect
airbag control unit
wiring harness plug X 90
(observe safety measures)
|
|
Important:
If trouble code 21 or trouble code 22 is
stored, the driver's airbag unit circuit must also be measured according to
test step 02.
The control unit determines which ignition
circuit contains a short circuit to ground or voltage.
|
|
|
· Inspect
co-driver airbag unit U 22
(do not measure at airbag unit terminals /
observe safety measures)
|
No damage to wiring harness plug and short
circuit bridge
|
· Co-driver
airbag unit U 22 defective
|
|
|
· Connect
battery
· Ignition
ON
|
|
|
|
|
· Measure
voltage:
from: co-driver airbag unit wiring
harness plug X 93 Ter. 1 (cable colour GERT: yellow/red)
to: ground
and
from: co-driver airbag unit wiring
harness plug X 93 Ter. 2(cable colour GEBL: yellow/blue)
to: ground
Note:
Use Adapter KM-609-20
|
less than 0.1 V
less than 0.1 V
|
· Short
circuit to voltage
from: co-driver airbag
unit wiring harness plug Ter. 1
to: airbag control
unit wiring harness plug X 90 Ter. 5
· Short circuit to voltage
from: co-driver airbag
unit wiring harness plug Ter. 2
to: airbag control
unit wiring harness plug X 90 Ter. 6
|
|
|
· Ignition
OFF
· Disconnect
battery
· Using
multimeter, measure resistance:
from: co-driver airbag
unit wiring harness plug X 93 Ter. 1 (cable colour GERT: yellow/red)
to: co-driver
airbag unit wiring harness plug X 93 Ter. 2 (cable colour GEBL: yellow/blue)
Note:
Use Adapter KM-609-20
|
less than 2 W
|
· Lead
interruption
from: co-driver airbag
unit wiring harness plug X 93 Ter. 1
to: airbag control
unit wiring harness plug X 90 Ter. 5
· Lead interruption
from: co-driver airbag
unit wiring harness plug X 93 Ter. 2
to: airbag control
unit wiring harness plug X 90 Ter. 6
· Short
circuit bridge in airbag control unit wiring harness plug X 90 defective
(short circuit bridge between Ter. 5 and Ter. 6)
|
|
|
· Insert
Adapter KM-609-9 from Electronic Kit I in airbag control unit wiring harness
plug X 90, in slot under Ter. 5 and Ter. 6 (short circuit bridge opened)
|
|
|
|
|
· Using
multimeter, measure resistance:
from: co-driver airbag
unit wiring harness plug X 93 Ter. 1(cable colour GERT: yellow/red)
to: co-driver
airbag unit wiring harness plug X 93 Ter. 2 (cable colour GEBL: yellow/blue)
Note:
Use Adapter KM-609-20
|
greater than
100 kW (¥)
|
· Short
circuit in wiring harness
from: airbag control
unit wiring harness plug X 90 Ter. 5
to: airbag control
unit wiring harness plug X 90 Ter. 6
|
|
|
· Using
multimeter, measure resistance:
from: co-driver airbag
unit
wiring harness
plug X 93 Ter. 1 (cable colour GERT: yellow/red)
to: ground
and
from: co-driver airbag
unit
wiring harness
plug X 93 Ter. 2 (cable colour GEBL: yellow/blue)
to: ground
Note:
Use Adapter KM-609-20
|
greater than
100 kW (¥)
greater than
100 kW (¥))
|
· Short
circuit to ground
from: co-driver airbag
unit wiring harness plug X 93 Ter. 1
to: airbag control
unit wiring harness plug X 90 Ter. 5
· Short circuit to ground
from: co-driver airbag
unit wiring harness plug X 93 Ter. 2
to: airbag control
unit wiring harness plug X 90 Ter. 6
|
|
|
· Connect
airbag control unit
wiring harness plug X 90
(observe safety measures)
Note:
Only driver's and co-driver's airbag units:
As neither the contact unit nor the driver's
and co-driver's airbag units are connected, trouble codes 31 and 33 must be
set.
|
|
|
|
|
· Connect
battery
· Ignition
ON
(TECH 1 ist not connected)
|
Fault recognized and stored after approx. 5 s
(System telltale ON)
|
· Control
unit defective.
|
|
|
· Read
trouble code with TECH 1
Only driver's airbag unit U 21 and co-driver's
unit U 22:
|
Trouble codes 31 and 33 present
|
· Control
unit defective.
|
|
|
· Bridge
co-driver airbag unit
wiring harness plug
from: co-driver airbag
unit wiring harness plug X 93 Ter. 1(cable colour GERT: yellow/red)
to: co-driver
airbag unit wiring harness plug X 93 Ter. 2(cable colour GEBL: yellow/blue)
Note:
Use Adapter KM-609-20
|
|
|
|
|
· Read
trouble code with TECH 1
Only driver's airbag unit U 21 and
co-driver unit U 22:
|
Trouble code 31 present
Trouble code 33 not present
|
· Control
unit defective.
|
|
|
|
If nominal values attained
|
· Co-driver
airbag unit U 22 defective.
Note:
After diagnosis/repairs ensure that all plug
connections have been properly restored.Then clear all trouble codes with
TECH 1.
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