Isuzu Trooper 1999 Workshop Manual page 2272

9J1–24 RESTRAINT CONTROL SYSTEM
Diagnostic Aids:
An intermittent condition is likely to be caused by a poor
connection at terminals "1" and "2" of the SRS coil 2–pin
connector at the base of the steering column, terminal "1"
and "2" of the driver air bag assembly 2–pin connector at
the top of the steering column, SDM terminals "3" and "4"
or a poor wire to terminal connection in CKT IB05–YEL or
DTC 21 Driver Deployment Loop Resistance High
Step
1 Perform the "SRS Diagnostic System Check".
Was the "SRS Diagnostic System Check" performed?
2 1. When measurements are requested in this chart use J–39200
DVM with correct terminal adapter from J–35616–A.
2. Use scan tool data list function, read and record the driver
deployment loop resistance.
Is driver resistance more than 3.7 ohms?
3 1. Ignition switch "OFF."
2. Disconnect SRS coil assembly yellow 2–pin connector located
at base of steering column is seated properly.
Is the 2–pin connector connected properly?
4 1. Disconnect and inspect the SRS coil assembly yellow 2–pin
connector located base of steering column.
2. If ok, reconnect the SRS coil
connector.
3. Ignition switch "ON."
Is DTC 21 current?
5 1. Ignition switch "OFF."
2. Disconnect SRS coil and passenger air bag assembly, yellow
2–pin connector located at the base of steering column and
behind the glove box assembly.
3. Connect SRS driver / passenger load tool J–41433 and
appropriate adapter to SRS coil
assembly harness connectors.
4. Ignition switch "ON."
Is DTC 21 current?
6 1. Ignition switch "Off."
2. There has been a increase in the total circuit resistance of the
driver deployment loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking CKTS IB05–YEL and IB06–YEL/BLK, and SDM
connector terminal "3" and "4" to locate the root cause.
Was a fault found?
IB06–YEL/BLK. The test for this diagnostic trouble code
is only run while the "AIR BAG" warning lamp is
performing the bulb check, unless DTC 17 or DTC 26 is
detected. 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.
Action
assembly yellow 2–Pin
and passenger air bag
Yes
Repeat the "SRS
Diagnostic
Go to Step 2 System Check"
Go to Step 3 Go to Chart A
Seat SRS coil
assembly 2–pin
connector
properly
Go to Step 4 Go to Step 8
Go to Step 5 Go to Step 8
Go to Step 6 Go to Step 7
Replace SRS
harness
Go to Step 8 Go to Chart A
No