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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 325 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B269A, B269C, or B269D: Heater Coolant Pump Control >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Relay Coil B+ 1 1 - -
Relay Switch Ignition B269C B269C - -
Relay Coil Control B269C, 2 B269A B269D -
Relay Switch Control 1 1 2 -
Component Ground - 1 - -
1. Coolant Pump inoperative
2. Coolant Pump operates continuously