Owner's Problem Description
The owner is trying to locate the starter relay for their 2008 Dodge Avenger. They believe that a conventional starter relay should exist but are having difficulty finding it. They've checked various locations under the hood and are seeking clarification on whether a standard relay is present or if it is integrated into another module.
Professional Technical Analysis
The 2008 Dodge Avenger utilizes a Totally Integrated Power Module (TIPM) which integrates the functions of a traditional starter relay. The TIPM is located on the left side of the engine compartment, beneath the fuse box. Unlike older vehicles that utilize standalone relays, the Avenger's design simplifies the electrical architecture but may confuse those accustomed to conventional setups. When diagnosing a no-start condition, it's critical to check for power at the starter trigger wire when the key is in the crank position. If there is no power present, further diagnostics on the TIPM and its connections are necessary. In some cases, TIPM failures can lead to common symptoms like intermittent starting issues or complete no-start conditions. It's essential to refer to the vehicle's wiring diagrams for troubleshooting and to verify the integrity of the connections to the TIPM to ensure proper operation.
Possible Causes
Most common causes (ordered by frequency):
- TIPM Integration Failure: The 2008 Dodge Avenger does not have a standalone starter relay; instead, the function is integrated into the TIPM. If the TIPM fails, it may not send the necessary signal to the starter motor, resulting in a no-start condition. The TIPM must be tested for proper operation, and connections should be inspected for corrosion or damage. - No power at starter trigger wire when the key is in the crank position, TIPM diagnostic codes indicating failure.
- Wiring Issues: Damaged or corroded wiring between the ignition switch and TIPM can prevent the appropriate signal from reaching the starter. This is often overlooked in diagnostics but can be a common failure point. - Visual inspection shows frayed wiring or corrosion at connections, intermittent starting issues.
Diagnostic Steps
Professional Diagnosis Process
Follow these systematic steps to accurately diagnose the issue. Each step builds on the previous one to ensure accurate diagnosis.
- STEP 1 - Visual Inspection: Begin with a thorough visual inspection of the TIPM and surrounding wiring. Look for signs of damage, corrosion, or loose connections. Ensure that the TIPM is properly secured and that there are no obvious physical defects.
- STEP 2 - Power Check: With the key in the crank position, check for voltage at the starter trigger wire. A multimeter should show 12V. If there is no voltage, further investigate the TIPM and ignition switch.
- STEP 3 - TIPM Diagnostic Testing: If no power is detected, utilize a professional OBD-II scanner or GeekOBD APP to read any diagnostic trouble codes (DTCs) from the TIPM. This can provide insights into any internal faults or communication issues.
- STEP 4 - Wiring Integrity Check: Inspect the wiring between the ignition switch and TIPM for continuity. Use a multimeter to check resistance and ensure there are no breaks or shorts in the circuit.
