rob71
TYF Newbie
The BCM door ajar inputs are:
cargo door/liftgate switch is pin A1 (pink/black wire) on Connector C6 (the purple plug)
right rear door is pin A2 (light green/black wire) on C6
left rear door is pin A3 (light blue/black wire) on C6
just for your information, the front door switches are via class 2 serial data from the front door modules (ie. the front door switches are not directly connected to the BCM).
Anyhow, these switch inputs will be grounded when each door is open. If you see that one of the door inputs is always grounded no matter if the door is open or closed then you'll want to look at the wiring and the door switches. If you don't find that one of the inputs is stuck to ground, then that suggests a problem with the BCM.
I would guess that the light problem might be the wiring to the light sensor that's supposed to tell the BCM that it's dark or light out. I'm not sure how to test the sensor. According the diagram the sensor is a phototransistor, with one side connected to ground at the BCM (black wire at pin B7 on BCM connector C4, the light blue 24 pin plug), and the other side connected to an input on the BCM (white wire at pin A4 on BCM C3, the 24 pin brown plug). The voltage at the white wire should change depending on whether the sensor is seeing daylight or darkness. You will need a good voltmeter or DMM to test that input. If the white wire always has 5V on it, that suggest that the ground wire to the light sensor is broken.
Hope that's of some help.
cargo door/liftgate switch is pin A1 (pink/black wire) on Connector C6 (the purple plug)
right rear door is pin A2 (light green/black wire) on C6
left rear door is pin A3 (light blue/black wire) on C6
just for your information, the front door switches are via class 2 serial data from the front door modules (ie. the front door switches are not directly connected to the BCM).
Anyhow, these switch inputs will be grounded when each door is open. If you see that one of the door inputs is always grounded no matter if the door is open or closed then you'll want to look at the wiring and the door switches. If you don't find that one of the inputs is stuck to ground, then that suggests a problem with the BCM.
I would guess that the light problem might be the wiring to the light sensor that's supposed to tell the BCM that it's dark or light out. I'm not sure how to test the sensor. According the diagram the sensor is a phototransistor, with one side connected to ground at the BCM (black wire at pin B7 on BCM connector C4, the light blue 24 pin plug), and the other side connected to an input on the BCM (white wire at pin A4 on BCM C3, the 24 pin brown plug). The voltage at the white wire should change depending on whether the sensor is seeing daylight or darkness. You will need a good voltmeter or DMM to test that input. If the white wire always has 5V on it, that suggest that the ground wire to the light sensor is broken.
Hope that's of some help.
