4-Pin 15369055 Daytime Running Light, Fog Light & Water Temperature Sensor Connector – Cadillac

Direct-fit replacement for GM/Cadillac OEM part number 15369055, used across multiple Cadillac platforms for daytime running light (DRL) modules, front fog light assemblies, and coolant water temperature sensor harnesses. This connector is a common failure point on aging Cadillac wiring harnesses due to heat cycling and road salt exposure.

Key Specifications

• OEM Part Number: 15369055
• Pin Count: 4
• Gender: Female (with wire)
• Wire Gauge: 18 AWG (0.5 mm²)
• Wire Length: 5.5 inches (140 mm)
• Housing Material: PA66 glass-filled nylon
• Terminal Material: Copper alloy, tin-plated
• Waterproof Rating: IP68
• Voltage Rating: 12V DC

Compatible Applications

• Daytime Running Light (DRL) module connector – Cadillac CTS, STS, DTS, Escalade
• Front fog light assembly harness – Cadillac SRX, ATS, XTS
• Coolant water temperature sensor – GM 3.6L V6 and 4.6L V8 engines
• Cross-reference: Verify OEM part number 15369055 on your vehicle before ordering

Common Failure Symptoms

When the 15369055 connector fails, you may experience:

• DRL not working – one or both daytime running lights inoperative
• Fog light failure – fog lights not responding to switch input
• P0116 / P0117 / P0118 – Engine Coolant Temperature (ECT) sensor circuit fault codes
• Erratic temperature gauge – gauge reads cold or pegged hot due to open circuit at sensor connector
• Fan running continuously – ECM defaults to maximum cooling when ECT signal is lost

Diagnosis Procedure

Before replacing the sensor or module, inspect the 15369055 connector:

1. Disconnect the connector and inspect for green corrosion, bent pins, or cracked housing
2. Measure pin-to-pin resistance – any reading above 0.5Ω indicates terminal corrosion
3. Check for moisture inside the connector body – a sign of failed wire seals
4. Apply dielectric grease to terminals before reconnecting

Frequently Asked Questions

Q: What Cadillac models use the 15369055 connector?
A: The 15369055 is used across multiple GM/Cadillac platforms including the CTS (2003–2014), STS (2005–2011), DTS (2006–2011), Escalade (2002–2013), SRX (2004–2009), and ATS (2013–2019). Always verify by OEM part number.

Q: Can this connector be used for both DRL and water temp sensor applications?
A: Yes. The 15369055 housing is used for multiple 4-pin applications across GM platforms. The physical connector is identical – the application depends on which harness it is installed in.

Q: What causes the P0117 code on Cadillac?
A: P0117 (ECT Sensor Circuit Low) is most commonly caused by a short to ground in the sensor circuit or a failed connector. Inspect the 15369055 connector for corrosion or water ingress before replacing the ECT sensor itself.

Q: Is this connector compatible with Chevrolet and GMC vehicles?
A: The 15369055 is a GM-platform connector used across Cadillac, Chevrolet, and GMC vehicles. Cross-reference your OEM part number to confirm fitment on non-Cadillac GM applications.

Package Contents

1 × 4-Pin Female Connector (15369055) with 18 AWG wire and terminal insert