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Diagnostic Fault Information Circuit/System Description The Driver Door Switch (DDS) and Passenger Door Switch (PDS) determine the position of the Conditions for Running the DTC The ignition is ON. Conditions for Setting the DTC B1580 An improper voltage level is seen on the Driver/Passenger Mirror Horizontal Position Sensor B1590 An improper voltage level is seen the Driver/Passenger Mirror Vertical Position Sensor Signal Action Taken When the DTC Sets Mirror movement is suspended so long as the fault is present. Conditions for Clearing the DTC Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance 5-Volt Reference B1580, B1590 B1580, B1590 B1580, B1590 - Driver/Passenger Mirror B1580 B1580 B1580 - Driver/Passenger Mirror B1590 B1590 B1590 - Low Reference B1580, B1590 B1580, B1590 B1580, B1590 -
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
A current DTC will clear when the fault is no longer present. A history DTC will clear after 40 malfunction-free ignition cycles. Reference Information Schematic Reference Outside Rearview Mirror Schematics Connector End View Reference Component Connector End Views Description and Operation Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool References Control Module References For Scan Tool Information. Circuit/System Verification Ignition ON, observe the scan tool Mirror Horizontal Position and Mirror Vertical Position Circuit/System Testing 1. Ignition OFF, disconnect the harness connector X7 at the appropriate door switch. 2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
5-volt reference circuit terminal 7 Signal circuit terminal 4 Signal circuit terminal 5 Low reference circuit terminal 10 If the test lamp illuminates, test the appropriate circuit for a short to voltage. 3. Ignition OFF, test for infinite resistance between the following circuits and ground: 5-volt reference circuit terminal 7 Signal circuit terminal 4 Signal circuit terminal 5 Low reference circuit terminal 10 If less than the specified value, test the appropriate circuit for a short to ground. 4. Test for 4K-7K ohms of resistance between the 5-volt reference circuit terminal 7 and the low reference circuit terminal 10. If not within the specified range, test the 5-volt reference circuit and the low reference 5. Test for 1K-7K ohms of resistance between the 5-volt reference circuit terminal 7 and the signal circuit terminal 4. If not within the specified range, test the signal circuit for an open/high resistance. If 6. Test for 1K-7K ohms of resistance between the 5-volt reference circuit terminal 7 and the signal circuit terminal 5. If not within the specified range, test the signal circuit for an open/high resistance. If 7. If all circuits test normal, replace the appropriate door switch. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Outside Rearview Mirror Motor Replacement Control Module References for DDS or PDS replacement, setup, and programming DTC B1640 Diagnostic Instructions
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC B1640 01 Mirror Heater Circuit Short to Battery DTC B1640 02 Mirror Heater Circuit Short to Ground Diagnostic Fault Information Circuit/System Description The Driver Door Switch (DDS) and Passenger Door Switch (PDS) supply voltage to the outside Conditions for Running the DTC The heated mirrors or commanded ON. Conditions for Setting the DTC B1640 01 A short to voltage is detected on the mirror heating element supply voltage circuit while the Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Mirror Heating Element B1640 02 1 B1640 01 - Low Reference - 1 1 - 1. Heated Mirror Malfunction
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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