PRE-RELEASE
DTC B3588
| DTC B3588 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC B3588 00
Rear Fog Lamp Switch Circuit Malfunction
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Headlamp Switch Reference Voltage | B257B 03 | B257B 03 | - | B3588 00 |
| Headlamp Switch Signal | B257B 03 | B257B 03 | B257B 07 | - |
| Circuit/System Description |
The body control module (BCM) supplies a reference voltage to the backlight dimmer switch, which is part of the headlamp switch. When the backlight dimmer switch is placed in a desired brightness position, reference voltage is applied through the backlight dimmer switch resistor ladder to the BCM. The BCM interprets this voltage signal and will command the interior lights to the desired brightness, command the front fog lamps or the rear fog lamps depending upon the switch setting selected.
| Conditions for Running the DTC |
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The ignition is turned ON.
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Low beam or front fog lamps illuminated.
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Rear fog lamp switch activated.
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| Conditions for Setting the DTC |
Rear fog lamp switch stuck.
| Action Taken When the DTC Sets |
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All cluster/backlighting defaults full bright
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Steering wheel cluster/backlighting dimming controls inoperative
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Front fog lamps are inoperative
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Rear fog lamps are inoperative
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| Conditions for Clearing the DTC |
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The DTC will be current for as long as the fault is present.
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When the fault is no longer present, the DTC will be a history DTC.
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A history DTC will clear after 40 ignition cycles.
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| Reference Information |
Schematic Reference
Fog Lights Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
Ignition ON, observe the scan tool Rear Fog Lamps Switch parameter. The parameter should change between Active and Inactive each time the rear fog lamp switch is pressed.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
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| 2. |
Ignition OFF, test for 0.4k Ω to 1 Ω between the signal circuit terminal 12 and ground.
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| 3. |
If greater than the specified value, test the low reference circuit for an short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
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If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
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Test for greater than 10 V between the 12 V reference circuit terminal 1 and ground.
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If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
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If all circuits test normal, replace the K9 BCM.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Headlamp Switch Replacement
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Control Module References
for BCM replacement, programming and setup
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