Isuzu KB P190. Manual — part 1430

9A1-38 RESTRAINT CONTROL SYSTEM

DTC Chart Test Description

Number(s) below refer to step number(s) on the
diagnostic chart:
2. This test determines whether the SRS control unit is

malfunctioning.

3. This test isolates the malfunction to one side of the

SRS coil assembly yellow 2–pin connector at the
base of the steering column.

4. This test determines whether the malfunction is in

the “Driver Bag High” circuit.

5. This test determines whether the malfunction is in

the “Driver Bag Low” circuit.

6. This test determines whether the malfunction is in

the SRS coil assembly or the driver air bag
assembly.

Diagnostic Aids

An intermittent condition is likely to be caused by a short
to ground/+B in the driver air bag assembly circuit.
Inspect circuits “Driver Bag High” and “Driver Bag Low”
carefully for cutting or chafing.

DTC B0026 (Flash Code 26) Driver Air Bag Squib Circuit Short to Battery Voltage

Step Action

Yes

No

1

Was the “SRS Diagnostic System Check” performed?

Go to Step 2

Go to the “SRS

Diagnostic System

Check”

2

1. When measurements are requested in this chart use a 5-

8840-0366-0 DMM with a correct terminal adapter from 5-
8840-2835-0.

2. Ignition switch is at “LOCK”.

3. Ignition switch is “ON”.

4. Check the driver air bag squib circuit for short to voltage or

short to ground and open.

Was a problem found?

Go to Step 3

3

1. Ignition switch is at “LOCK”.

2. Disconnect the SRS coil assembly yellow connector located

at base of the steering column. Leave the passenger air bag
assembly connected.

3. Connect the SRS driver /passenger load tool 5-8840-2421-0

and appropriate adapter to the SRS coil assembly harness
connector.

4. Ignition switch is “ON”.
Is DTC B0026 current?

Go to Step 4

Go to Step 6

4

Measure resistance on SRS control unit harness connector from
terminal “14” to terminal “1” (ignition).
Does 5-8840-0366-0 display “OL” (infinite)?

Go to Step 5

Replace SRS

harness.

Go to Step 7

5

Measure the resistance on the SRS control unit harness
connector from terminal “13” to terminal “1” (ignition).
Does 5-8840-0366-0 display “OL” (infinite)?

Go to Chart A

Replace SRS

harness.

Go to Step 7

RESTRAINT CONTROL SYSTEM 9A1-39

Step Action

Yes

No

6

1. Ignition switch is at “LOCK”.

2. Disconnect the SRS driver /passenger load tool 5-8840-2421-

0 from the SRS coil assembly harness connector.

3. Connect the SRS driver /passenger load tool 5-8840-2421-0

and appropriate adapter to the driver air bag assembly
harness connector. located at top of the steering column
connector.

4. Reconnect the SRS coil assembly harness connector at the

base of the steering column.

5. Ignition switch is “ON”.
Is DTC B0026 current?

Ignition switch is at

“LOCK”.

Replace SRS coil

assembly.

Go to Step 7

Ignition switch is at

“LOCK”.

Replace driver air

bag assembly.

Go to Step 7

7

1. Reconnect all components and ensure all components are

properly mounted.

2. Clear the diagnostic trouble codes.
Is this step finished?

Go to the “SRS

Diagnostic System

Check”

9A1-40 RESTRAINT CONTROL SYSTEM

DTC B0029 (Flash Code 29) Passenger Pretensioner Squib Circuit High
Resistance

RTW79ALF000301

Circuit Description

When the ignition switch is turned “ON”, the SRS
control unit will perform tests to diagnose critical
malfunctions within itself. Upon passing these tests
“Ignition 1”, and deployment loop voltages are
measured to ensure they are within their respective
normal voltage ranges. The SRS control unit then
proceeds with the “Resistance Measurement Test”.
“Passenger Pretensioner Low” terminal “10” is
grounded through a resister and the passenger current
source connected to “Passenger Pretensioner High”
terminal “11” allows a known amount of current to flow.

By monitoring the voltage difference between
“Passenger Pretensioner High” and “Passenger
Pretensioner Low” the SRS control unit calculates the
combined resistance of the passenger pretensioner
assembly, harness wiring circuits “Passenger
Pretensioner High” and “Passenger Pretensioner Low”
connector terminal contact.

RESTRAINT CONTROL SYSTEM 9A1-41

DTC Will Set When

The combined resistance of the passenger air
pretensioner assembly, harness wiring circuits
“Passenger Pretensioner High” and “Passenger
Pretensioner Low”, and connector terminal contact is
above a specified value. This test is run once each
ignition cycle during the “Resistance Measurement
Test” when:
1. No “higher priority faults” are detected during “Turn–

ON”,

2. “Ignition 1” voltage is in the specified value.

Action Taken

SRS control unit turns “ON” the “AIR BAG” warning
lamp and sets a diagnostic trouble code.

DTC Will Clear When

The ignition switch is at “LOCK”.

DTC Chart Test Description

Number(s) below refer to step number(s) on the
diagnostic chart:
2. This test determines whether the malfunction is in

the SRS control unit.

3. This test verifies proper connection of the yellow

connector.

4. This test checks for proper contact and/or corrosion

of the yellow connector terminals.

5. The test checks for a malfunctioning passenger

pretensioner assembly.

6. This test determines whether the malfunction is due

to high resistance in the wiring.

Diagnostic Aids

An intermittent condition is likely to be caused by a poor
connection at the passenger pretensioner assembly
harness connector terminals “1” and “2”, SRS control
unit terminal “11” and “10”, or a poor wire to terminal
connection in circuits “Passenger Pretensioner High”
and “Passenger Pretensioner Low”. This test for this
diagnostic trouble code is only run while the “AIR BAG”
warning lamp is performing the bulb check. When a
scan tool “Clear Codes” command is issued and the
malfunction is still present, the DTC will not reappear
until the next ignition cycle.

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Политика конфиденциальности