For a complete wiring diagram Refer to Section 8W.When Monitored:Continuously.Set Condition:The Totally Integrated Power Module (TIPM) Detects a HIGH condition.Possible Causes(L239) REAR FOG LAMP CONTROL CIRCUIT OPEN(L239) REAR FOG LAMP CONTROL CIRCUIT SHORTED TO VOLTAGELEFT AND/OR RIGHT REAR FOG LAMP BULBSTOTALLY INTEGRATED POWER MODULE1. INTERMITTENT CONDITIONTurn the ignition on.With the scan tool, clear all DTC's.Turn the Rear Fog Lamps on.With the scan tool, read DTC's.Does the scan tool display active: B1664-REAR FOG LAMP CONTROL CIRCUIT HIGH?YesGo To 2 NoThe condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) 2. LEFT AND RIGHT REAR FOG LAMP BULBSTurn the ignition off.Remove the Left and Right Fog Lamp Bulbs.Inspect the Left and Right Fog Lamp Bulbs.Are the inoperative bulbs OK?YesGo To 3NoReplace the Inoperative bulb(s) in accordance with the Service Information.Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) 3. (L239) REAR FOG LAMP CONTROL CIRCUIT OPENDisconnect the TIPM C6 harness connector.Disconnect the Left and Right Rear Fog Lamp harness connectors.Measure the resistance of the (L239) Rear Fog Lamp Control circuit between the Left and Right Rear Fog Lamp harness connectors and the TIPM C6 harness connector.Is the resistance below 10.0 ohms?YesGo To 4NoRepair the (L239) Rear Fog Lamp Control circuit for an open.Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) 4. (L239) REAR FOG LAMP CONTROL CIRCUIT SHORTED TO VOLTAGETurn the ignition on.Measure for voltage on the (L239) Rear Fog Lamp Control circuit.Is there any voltage present?YesRepair the (L239) Rear Fog Lamp Control circuit for a short to voltage.Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) NoReplace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)