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, Thu, 14 Oct 2010 18:29:17
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Steve,
1st you're to locate SRS test connector, it's hidden under that rubber harmonica by the center console (see the shot below). Then it's pretty straight forward: you connect the tester to the diagnostic connector, turn on ignition and start pulling out DTC's. When you're done, then switch ignition off and put the tester cable off the car test socket.
Here go some words on the tester from the service manual mentioned in the thread below.
Casing
The casing of the tester is made of impact and oil-resistant plastic and incorporates a hinged cover over the display and control panel.
Display
Specially designed LCD display comprising 14 segments.
Control panel
The control panel is specially designed and incorporates three membrane switches
Microprocessor
Eight-bit crystal-controlled processor with 1.8K of internal storage
Description
Saab's SRS-system tester has been developed fir efficient servicing and fault-diagnosis work. The tester set comprises the tester itself and a connecting lead with connector. Provision has been made for the connection of any accessories that may be available in the future.
All faults occurring in the system, be they permanent or intermittent, are stored in the ECU in the form of codes that can be displayed by the tester.
SRS-system tester
The tester connects to the special SRS-system test socket, located underneath the rubber gaiter between the radio console and the gear/selector lever, by means of a connector and a one-metre test lead.
Test for external faults
(in wiring, sensors, etc.)
Start by pressing B, whereupon EF will appear on the display.
Now press C.
Each time C is pressed a new code will be displayed in the sequence shown in the table below. The first time C is pressed, the SRS system code will be displayed. The second time, the program version and so on.
Example Explanation
of code
41 SRS system code
03 Program version
01 Duration of fault in hours
15 Duration of fault in minutes (first fault; shown in 5-minute increments)
2d Fault code (2-character alphanumeric)
L Fault type:
L = Permanent (lasting) fault (remains when ignition switched off)
S = Intermittent (sporadic) fault (disappears when ignition switched off)
If the duration of the fault exceeds 99 hours and 55 minutes, 99 hours and 55 minutes will be displayed
If more then one fault has been detected, each time the button C is depressed, the code for the next fault will be displayed, followed by the fault type. After the last fault has been displayed, EF will be displayed. Pressing C again will restart the test from the beginning, starting with display of the SRS system code.
Test for internal faults (in ECU)
Start by pressing A, whereupon IF will appear on the display.
Start the test by pressing C.
The test procedure is then the same is that for external faults (see above).
Deleting fault code from the memory.
Press A and C simultaneously, whereupon Er will appear on the display.
Press C.
The SRS system code will now be displayed.
Pressing C again will display the program version. The third time C is pressed, all fault codes will be deleted from the memory, acknowledged by 01 appearing on the display. If 02 is displayed (indicating unsuccessful deletion), the procedure must be repeated.
Fault code cannot be deleted if the airbag module has been activated.
ECU identification code
Each ECU has a unique identification code consisting of 10 digits, which can only be displayed two at time.
To display the identification code, start by pressing A and B simultaneously, whereupon 'th' will appear on the display. Precc C repeatedly to display the code two digits at a time.
Fault-code chart
FS1 = LH front sensor
FS2 = RH front sensor
Detonator 1 = Airbag detonator
SS = safety sensor (in ECU)
If more than one fault code has been displayed, rectify any external faults (in wiring, components, etc) first. Having rectified these, check fir internal faults again before replacing the ECU (SJ, do you hear me?)
If the fault is intermittent (type S), you may need to repeat the test procedure a number of times, wigging the wiring and connectors, before identifying the cause.
External faults
Code Malfunction
01 FS1: circuit made 1-5 times
02 FS1: circuit made more then 5 times
03 FS2: circuit made 1-5 times
04 FS2: circuit made more then 5 times
05 FS1: circuit made more then 2 s
06 FS2: circuit made more then 2 s
07 FS1: leakage to battery positive
08 FS2: leakage to battery positive
09 FS1: leakage to earth
0A FS2: leakage to earth
0B FS1: shorting to battery positive
0C FS2: shorting to battery positive
0E System earth resistance too high
0F FS1: resistance to earth 3 ohm or higher
10 FS2: resistance to earth 3 ohm or higher
11 FS1: break in wiring
12 FS2: break in wiring
13 FS1: resistance in wiring too high
14 FS2: resistance in wiring too high
17 Capacitance of 4700 mF capacitor low
19 Tranfer resistance of 4700 mF capacitor high
1b Detonator 1: leakage to battery [psotove
1e Detonator 1: shorting to battery positive
21 Detonator 1: leakage to earth
24 Detonator 1: shorting to earth
27 Detonator 1: break in circuit continuity
2A Detonator 1: resistance low
2D Detonator 1: resistance high
30 SRS warning light shorting to battery positive or earth
31 SRS warning light faulty
Deal with fault codes 1-31 before testing for internal faults.
Internal faults
32 Diagnostics function defective
33/34 Collision recording (will be displayed after a collision in which airbag has been activated successfully)
39 Capacitor 4700 mF: voltage low
3A Capacitor 4700 mF: voltage high
3E Diode D5: short circuit or break in circuit continuity
40 Detonator 1: power supply
43 Diode D7: short circuit or break in circuit continuity
44 Diode D8: short circuit or break in circuit continuity
47 FS1: power supply defective
48 FS2: power supply defective
49 SS: break in wiring
4b SS: circuit made more the 2 s
52 Detector IC defective
53 5V regulation defective
54 EEPROM defective
56 Detector IC: temperature high
57 Microprocessor faulty
58 Multiplexer faulty
59 Supply for detector current for leakage current defective
5a A/D converter faulty
5b FS1 monostable flip-flop out of spec
5c FS2 monostable flip-flop out of spec
5d SS monostable flip-flop out of spec
5e Collision recording initiation defective
5f Sensor-recording initiation defective
posted by 77.37.1...
, Thu, 14 Oct 2010 18:29:17, Fri, 15 Oct 2010 09:25:16
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