B1674
B1674 - Driver Courtesy Lamp Control Circuit High
For a complete wiring diagram, refer to.
Theory of Operation
Whenever the door module is awake, it supplies approximately eight volts on the Door Courtesy Lamp Driver circuit. There is only a 0.2 ma draw on the circuit when the lamp is connected. Therefore, the lamp does not light. If the lamp connector is disconnected, causing an open circuit, this code will set.
• When Monitored: Whenever the module is awake.
• Set Condition: When the courtesy lamps are off and the Driver Door Courtesy Lamp Driver circuit is shorted to battery voltage or there is no load (open) on the circuit.
Test Step 1 - TEST FOR INTERMITTENT CONDITION
• Turn the ignition on.
• With the scan tool, record and erase the DTCs.
• Turn the courtesy lamps on and then off.
• Wait 30 seconds.
• With the scan tool, read the DTCs.
Does the scan tool display: B1674-DRIVER COURTESY LAMP CONTROL CIRCUIT HIGH?
Yes
• Go to Test Step 2
No
• Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 2 - (Z908) GROUND CIRCUIT OPEN
• Turn the ignition off.
• Remove the inner door panel trim..
• Turn the ignition on.
• Turn the courtesy lamps off.
• Close the doors or trip the door latch to closed.
• Using a 12-volt test light connected to 12-volts, check the (Z908) Ground circuit in the Driver Door Courtesy Lamp connector.
Does the test light illuminate brightly?
No
• Repair the (Z908) Ground circuit for an open.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Yes
• Go to Test Step 3
Test Step 3 - (M43) DRIVER DOOR COURTESY LAMP DRIVER CIRCUIT SHORT TO BATTERY
• Using a 12-volt test light connected to ground, check the (M43) Driver Door Courtesy Lamp Driver circuit in the Driver Door Courtesy Lamp connector.
Does the test light illuminate brightly?
No
• Go to Test Step 5
Yes
• Go to Test Step 4
Test Step 4 - (M43) DRIVER DOOR COURTESY LAMP DRIVER WIRE SHORT TO BATTERY
• Turn the ignition off.
• Disconnect the Driver Door Module C5 harness connector.
• Ensure the courtesy lamps are off.
• Turn the ignition on.
• Using a 12-volt test light connected to ground, check the (M43) Driver Door Courtesy Lamp Driver circuit.
Does the test light illuminate brightly?
Yes
• Repair the (M43) Driver Door Courtesy Lamp Driver circuit for a short to battery. The most probable cause would be a short to the (F921) Fused Ignition Switch Output circuit. Turn the ignition off and recheck. If the test light continues to light, repair the circuit for a short to battery.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Replace the Driver Door Module (DDM).
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 5 - DRIVER DOOR COURTESY LAMP
• Turn the courtesy lamps on.
• Using a 12-volt test light connected to ground, check the (M43) Driver Door Courtesy Lamp Driver circuit.
Does the test light illuminate brightly?
Yes
• Replace the Driver Door Courtesy Lamp.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Go to Test Step 6
Test Step 6 - (M43) DRIVER DOOR COURTESY LAMP DRIVER CIRCUIT OPEN
• Turn the ignition off.
• Disconnect the Driver Door Module C5 connector.
• Measure the resistance of the (M43) Driver Door Courtesy Lamp Driver circuit between the DDM C5 connector and the Lamp connector.
Is the resistance below 5.0 ohms?
Yes
• Replace the Driver Door Module.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Repair the (M43) Driver Door Courtesy Lamp Driver circuit for an open.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior