DTC B2802 Keyless Entry Data Circuit Low. Oldsmobile Alero 2000

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 2000 🢒 Alero 🢒 Body and Accessories 🢒 Keyless Entry 🢒 DTC B2802 Keyless Entry Data Circuit Low

Keyless Entry Component Views
Keyless Entry Schematics
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Power Distribution Schematics

Circuit Description

The Body Control Module (BCM) is connected to the Remote Control Door Lock Receiver by the keyless entry serial data circuit. This circuit is the link for communication between the two modules.

Conditions for Running the DTC

The DTC can run at any time.

Conditions for Setting the DTC

•	The BCM detects a short to ground in the communication circuit.

•	The condition above must be present for more than 0.3 seconds.

Action Taken When the DTC Sets

The BCM stores DTC B2802 in memory.

Conditions for Clearing the DTC

•	The condition for setting the DTC is no longer present and the scan tool Clear DTCs function is used.

•	The BCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

•	Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with a reappearance of the malfunction.

•	If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

This step checks to see if the Keyless Entry Serial Data circuit is at 4-5V.

Step	Action	Value(s)	Yes	No
1	Did you perform the Remote Keyless Entry Diagnostic System Check?	--	Go to Step 2	Go to Diagnostic System Check - Remote Keyless Entry
2	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the status of DTC B2802. Is the DTC B2802 a current code?	--	Go to Step 3	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3	Turn OFF the ignition. Disconnect the Remote Control Door Lock Receiver. Connect a DMM from the Keyless Entry Serial Data circuit to ground. Turn ON the ignition, with the engine OFF. Observe the voltage. Does the DMM indicate the specified value?	4-5V	Go to Step 5	Go to Step 4
4	Test the Keyless Entry Serial Data circuit for an open, high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 9	Go to Step 6
5	Inspect for poor connections at the harness connector of the Remote Control Door Lock Receiver. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 9	Go to Step 7
6	Inspect for poor connections at the harness connector of the Body Control Module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 9	Go to Step 8
7	Important: All transmitters which are to be recognized by the Remote Control Door Lock receiver must be programmed in a single programming sequence. If the system is placed in program mode it will erase all previously programmed transmitters upon the receipt of the programming signal from the first transmitter. Replace the Remote Control Door Lock Receiver. Refer to Receiver Replacement . Did you complete the replacement?	--	Go to Step 9	--
8	Replace the Body Control Module. Refer to Body Control Module Replacement . Perform the Body Control Module Set Up procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration . Did you complete the replacement and set up procedure?	--	Go to Step 9	--
9	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	--	Go to Step 2	System OK