B1DA7
B1D53,B1DA7 - SWITCH POWER SUPPLY CIRCUIT LOW - MMMB1D53, B1DA7 - Switch Power Supply Circuit Low - MMM:
WHEN MONITORED
Continuously.
SET CONDITION
Whenever the Mirror Switch Supply circuit is below 6.8 volts for over two seconds, this code will set.
POSSIBLE CAUSES
- PCM battery voltage low DTC
- (P550) Mirror switch supply circuit partial short to ground
- Mirror switch
- Driver memory mirror module
Theory of operation
On vehicles with the memory system, the Mirror Switch receives its power supply from the Driver Memory Mirror Module. When this code is logged in the Passenger Memory Mirror Module, it has received a bus message from the Driver Module that the power supply for the mirror switch is low. There are no repairs for the passenger side. All repairs are done to the driver side.
Diagnostic Test
1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTC's
Operate the driver mirror several times from the mirror switch
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read DTC's.
Q: Does the scan tool display SWITCH POWER SUPPLY CIRCUIT LOW?
YES: Go To 2
NO: The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. CHECK ENGINE DTC's
With the scan tool, read engine DTC's
Q: Does the scan tool display any BATTERY VOLTAGE LOW related DTC's?
YES: Refer to the symptom list for problems related to ENGINE.
NO: Go to 3
3. MIRROR SWITCH SHORTED
Disconnect the Mirror Switch connector.
Measure the voltage between the (P550) Mirror Switch Supply circuit and ground.
Q: Is the voltage above 10.0 volts?
YES: Replace the Mirror Switch. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go to 4
4. (P550) MIRROR SWITCH SUPPLY CIRCUIT PARTIAL SHORT TO GROUND
Turn the ignition off.
Disconnect the Driver Memory Mirror Module connector.
Measure the resistance between ground and the (P550) Mirror Switch Supply circuit.
Q: Is the resistance below 5000.0 ohms?
YES: Repair the (P550) Mirror Switch Supply circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Driver Memory Mirror Module. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test