B2403

Diagnostic Trouble Code (DTC) Chart (Part 1 Of 2):

Diagnostic Trouble Code (DTC) Chart (Part 2 Of 2):

Wiring Schematic:

CIRCUIT DESCRIPTION
When the ignition switch is on, the BCM provides a ground feed to the fog lamp switch through circuit 192. Turning the fog lamp switch to the ON position sends a ground signal from circuit 192 to circuit 1317, enabling the FOG LP relay.

CONDITIONS FOR SETTING THE DTC
^ The BCM detects a short to B+ in circuit 192 when the ignition switch is on.
^ The BCM detects a short to B+ in circuit 1317 when the ignition switch is on and the fog lamp switch is on.

ACTIONS TAKEN WHEN THE DTC SETS
^ The BCM stores DTC B2403 in memory.
^ The BCM turns off its output to the fog lamp relay.

CONDITIONS FOR CLEARING THE DTC
^ Voltage is no longer detected by the BCM in circuit 192 when the ignition switch is cycled from off to on.
^ A history DTC will clear after 100 consecutive ignition cycles if the condition for the fault is no longer present.
^ An ignition cycle is needed to change the status of this DTC from current to history.
^ Using a scan tool.

DIAGNOSTIC AIDS
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to B+ in circuit 192.
- An intermittent short to B+ in circuit 1317.
^ If the DTC is a history DTC, the problem may be intermittent. Try performing the tests shown while moving wiring and connectors, this can often cause the malfunction to reappear.
^ DTC P1626 will set in the Powertrain Control Module (PCM) when the ignition switch is on with the Body Control module (BCM) disconnected. When BCM diagnostics and repairs are completed, refer to A Powertrain On Board Diagnostic (OBD) System Check for additional information on PCM related DTCs in Computers and Control Systems Testing.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This step checks for a short to B+ in circuit 192.
3. This step determines whether circuit 192 has a short to B+ or the BCM is faulty.
4. This step checks for a short to B+ in circuit 1317.
5. This step determines whether circuit 1317 has a short to B+ or the FOG LP relay is faulty.
6. This step checks for a short to B+ in the fog lamp switch.
7. This step determines whether the short to B+ is in the underhood accessory wiring junction block or in circuit 1317.