Question about 1993 Saab 900

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Cruise control works intermittently

I have a 93 900s in which the cruise control works occasionally. The resume function does not seem to work at all. (I recently bought the car) Sometimes when the cruise is working it will suddenly turn off as if I had hit the brakes. I can't tell if it is a mechanical issue or an electrical one, or if the stalk switch is worn out or what? After switching off spontaneously I am unable to reset it. There is no rhyme or reason to this problem that I can detect so far. Thanks

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  • jagiel4 Mar 03, 2009

    same problem, cruise control will just shut off when driving

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The problem most likely is with the cruise control computer (ECU) and the fix is to replace it with an older version. I had the same problem and tried replacing other parts and even replacing the ECU with a rebuilt one of the same vintage as the 1993 model. I had the ECU replaced with the previous version at a Saab specialist and it now works all the time. There is a difference in the connections between the different year ECUs that requires some rewiring - you can find rewiring information on the internet.

Posted on Apr 13, 2009

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Posted on Jan 02, 2017

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1 Answer

2005 trailblazer cruise control not working or the cruise control light not working


Which engine does your trailblazer have 5.3 or 4.2 L
Cruise Control Description and Operation (5.3L)
Cruise Control Description and Operation (4.2L)
makes a difference ! The best way to start diagnostic's is with a scan tool . May have DTC'S diagnostic trouble codes .
DTC P1574 Stop Lamp Switch Circuit
DTC P0568 Cruise Control Set Switch Circuit
DTC P0567 Cruise Control Resume Switch Circuit
Plus with a scan tool you can see if the cruise control switch is inputing to PCM. Data list .
The cruise control resume/accel switch is an input to the powertrain control module (PCM). The PCM uses the cruise control resume/accel switch signal circuit in order to detect when the driver has requested to accelerate the set vehicle speed or to resume the cruise control system. The PCM detects a voltage signal on the cruise control resume/accel switch signal circuit when the switch is applied. This DTC sets if the PCM senses voltage on the cruise control resume/accel switch signal circuit for longer than 90 seconds.
Cruise Control Indicator Inoperative (4.2L)
Turn OFF the ignition.
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With the scan tool, Command the Cruise Control Lamp Test parameter ON, in the instrument panel cluster (IPC) Output Controls.
Does the Cruise indicator illuminate in the IPC?
YES - Go to Step 3
no - Go to Step 4
3
Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
YES - Go to Step 7
NO - Go to Step 6
4
Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
YES - Go to Step 7
NO - Go to Step 5
5
Replace the IPC. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
YES - Go to Step 7
--
6
Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
Go to Step 7
--
7
Operate the system in order to verify the repair.
Does the system operate properly?
System OK
Go to Step 2

Cruise Control Inoperative/Malfunctioning (4.2L)

Install a scan tool.
Turn ON the ignition, with the engine OFF.
Press the cruise ON/OFF switch OFF.
With the scan tool, observe the Cruise ON/OFF switch parameter in the powertrain control module (PCM) Cruise Control Data list.
Does the Cruise ON/OFF switch parameter display OFF?

Your best bet mite be to take your vehicle to the dealer .

Dec 24, 2016 | Cars & Trucks

1 Answer

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2 Answers

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