For a complete wiring diagram Refer to Section 8W.When Monitored:Continuously.Set Condition:When the Totally Integrated Power Module (TIPM) detects a HIGH condition.Possible CausesCHECK (Z904) GROUND CIRCUIT(Z904) GROUND CIRCUIT OPENCHECK (L43) LEFT LOW BEAM CONTROL CIRCUIT(L43) LEFT LOW BEAM CONTROL CIRCUIT OPEN(L43) LEFT LOW BEAM CONTROL CIRCUIT SHORTED TO VOLTAGELEFT LOW BEAM BULBTOTALLY INTEGRATED POWER MODULE1. INTERMITTENT CONDITIONTurn the ignition on.With the scan tool, clear all DTC's.Turn the Headlamps on.With the scan tool, read DTC's.Does the scan tool display active: B162C-LEFT LOW BEAM CONTROL CIRCUIT HIGH?YesGo To 2NoThe 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. CHECK (Z904) GROUND CIRCUITSTurn the ignition off.Disconnect the Left Low Beam Lamp harness connector.With a 12–volt test light connected to 12–volts, probe each (Z904) Ground circuit.Does the test light illuminate brightly on each ground circuit?YesGo To 4NoGo To 33. (Z904) GROUND CIRCUIT OPENMeasure the resistance of the appropriate (Z904) Ground circuit(s) at the Left Low Beam harness connector.Is the resistance below 10.0 ohms?YesReplace the Inoperative bulb in accordance with the Service Information.Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) NoRepair the appropriate (Z904) Ground circuit(s) for an open.Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) 4. CHECK (L43) LEFT LOW BEAM CONTROL CIRCUIT

Turn the ignition on.With a 12–volt test light connected to ground, check the (L43) Left Low Beam Control circuit.Does the test light illuminate brightly with the headlamps switch turned on, and shut off with the headlamps turned off?YesReplace the Inoperative bulb in accordance with the Service Information.Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) NoGo To 55. (L43) LEFT LOW BEAM CONTROL CIRCUIT OPENTurn the ignition off.Disconnect the TIPM C3 harness connector.Measure the resistance of the (L43) Left Low Beam Control circuit between the Left Low Beam harness connector and the TIPM C3 harness connector.Is the resistance below 10.0 ohms?YesGo To 6NoRepair the (L43) Left Low Beam Control circuit for an open.Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) 6. (L43) LEFT LOW BEAM CONTROL CIRCUIT SHORTED TO VOLTAGETurn the ignition on.Measure for voltage on the (L43) Left Low Beam Control circuit.Is there any voltage present?YesRepair the (L43) Left Low Beam 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)