Symptoms - SIR. Chevrolet TrailBlazer

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2006 🢒 TrailBlazer - 2WD 🢒 General Information 🢒 Vibration Diagnosis and Correction 🢒 Symptoms - SIR

Important: The following steps must be completed before using the Symptom Tables.

Perform the Diagnostic System Check - Vehicle , before using the Symptom Tables in order to verify that all of the following are true:

•	There are no DTCs set.

•	The control module(s) can communicate via the serial data link.

Review the system operation in order to familiarize yourself with the system functions. Refer to SIR System Description and Operation.

•	Inspect for aftermarket devices which could affect the operation of the SIR system. Refer to Checking Aftermarket Accessories.

•	Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

•	Air Bag Indicator Circuit Malfunction

•	Passenger Presence System Indicator Circuit Malfunction