B1D4D
B1D4D - MEMORY SWITCH INPUT CIRCUIT STUCK - MEMORY MIRROR MODULEB1D4D - Memory Switch Input Circuit Stuck - Memory Mirror Module:
WHEN MONITORED
Continuously.
SET CONDITION
When the Door Lock Switch Mux circuit or the Memory Select Switch Mux is under 2.6 volts for over 30 seconds.
POSSIBLE CAUSES
- (G161) Driver door lock switch MUX wire partial short to ground
- (G161) Driver door lock switch MUX circuit shorted to the (G775) driver door lock switch return circuit
- (P339) Memory select switch MUX wire partial short to ground
- (P339) Memory select switch MUX circuit shorted to the (G920) memory select switch return circuit
- Memory selector switch
- Driver window/door lock switch stuck
- Driver memory mirror module
Theory of operation
This code will only set in vehicles that have the Memory System. The supply circuit for the Memory Mirrors are supplied by the Memory Mirror Module, therefore both the Memory Select Switch Mux or the Door Lock Switch Mux circuits can cause this DTC.
Diagnostic Test
1. TEST FOR INTERMITTENT CONDITION
With the scan tool, record and erase DTC's
Press the Memory Selector Switch several times in all positions.
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 MEMORY SWITCH INPUT CIRCUIT STUCK?
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. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
2. DRIVER DOOR LOCK SWITCH SHORTED TO GROUND
With the scan tool, erase DTC's.
Cycle the ignition from on to off 3 times.
Disconnect the Driver Window/Door Lock Switch C1 connector.
Turn the ignition on.
With the scan tool, read DTC's.
Q: Does the scan tool display MEMORY SWITCH INPUT CIRCUIT STUCK?
NO: Replace the Driver Window/Door Lock Switch. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
YES: Go to 3
3. MEMORY SELECTOR SWITCH SHORTED TO GROUND
With the scan tool, erase DTC's.
Disconnect the Memory Selector Switch connector.
Turn the ignition on.
With the scan tool, read DTC's.
Q: Does the scan tool display MEMORY SWITCH INPUT CIRCUIT STUCK?
NO: Replace the Memory Selector Switch. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
YES: Go to 4
4. (G161) DRIVER DOOR LOCK SWITCH MUX WIRE SHORT TO GROUND
Disconnect the Driver Memory Mirror Module C1 connector.
Measure the resistance between ground and the (G161) Driver Door Lock Switch Mux circuit in the Memory Mirror Module connector.
Q: Is the resistance below 10000.0 ohms?
YES: Repair the (G161) Driver Door Lock Switch Mux circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go to 5
5. (G161) DRIVER DOOR LOCK SWITCH MUX CIRCUIT SHORTED TO THE (G775) DRIVER DOOR LOCK SWITCH RETURN CIRCUIT
Measure the resistance between the (G161) Driver Door Lock Switch Mux circuit and the (G775) Driver Door Lock Switch Return circuit in the Memory Mirror Module connector.
Q: Is the resistance below 10000.0 ohms?
YES: Repair the (G161) Driver Door Lock Switch Mux circuit for a short to the (G775) Driver Door Lock Switch Return circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go to 6
6. (P339) MEMORY SELECT SWITCH MUX CIRCUIT SHORT TO THE GROUND
Disconnect the Driver Memory Mirror Module C2 connector.
Measure the resistance between ground and the (P339) Memory Select Switch Mux circuit.
Q: Is the resistance below 10000.0 ohms?
YES: Repair the Memory Select Switch Mux wire for a short to ground. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go to 7
7. (P339) MEMORY SELECT SWITCH MUX CIRCUIT SHORT TO THE (G920) MEMORY SELECT SWITCH RETURN CIRCUIT
Measure the resistance between the (P339) Memory Select Switch Mux circuit and the (G920) Memory Select Switch Return circuit in the Driver Memory Mirror Module C2 connector.
Q: Is the resistance below 10000.0 ohms?
YES: Repair the (P339) Memory Select Switch Mux circuit for a short to the (G920) Memory Select Switch return circuit. 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