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What will it take to correct? trouble shooting p1574 code shown on a 2006 HHR

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DTC P1574 Stoplamp Switch Circuit
The cruise release switch is a normally closed switch. The stop lamp switch signal circuit is a normally open switch. When the brake pedal is released, the engine control module (ECM) detects a high voltage signal on the torque converter clutch (TCC) brake switch/cruise control release signal circuit and a low signal voltage signal on the stop lamp switch signal circuit.

Diagnostic Aids
In order to avoid a misdiagnosis, perform the following:
• Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation .
• Inspect for proper adjustment of the stop lamps. Refer to Stop Lamp Switch Adjustment .
• For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .

Do the stop lamps work properly?
YES - Go to Step 3
NO - Go to Stop Lamps Inoperative
Test the stop lamp switch signal circuit for an open or for a high resistance between the body control module (BCM) and the engine control module (ECM). Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
YES - Go to Step 6
NO - Go to Step 4
Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
YES -- Go to Step 6
NO - Go to Step 5
Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
YES - Go to Step 6
Use a scan tool in order to clear the DTCs.
Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?
Go to Step 2
System OK

Posted on Dec 28, 2016


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