B1D4C

B1D4C - MEMORY SWITCH INPUT CIRCUIT HIGH - MEMORY MIRROR MODULE

B1D4C - Memory Switch Input Circuit High - Memory Mirror Module:

WHEN MONITORED
Continuously.

SET CONDITION
When the Door Lock Switch Mux circuit or the Memory Select Switch Mux circuit is above 5.25 volts for over 30 msec.

POSSIBLE CAUSES
- (G161) Driver door lock switch MUX wire short to voltage
- (P339) Memory select switch MUX wire short to voltage
- Window/door lock switch
- 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 Driver 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 time 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 HIGH?

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. DOOR LOCK SWITCH SHORTED TO VOLTAGE




With the scan tool, erase DTC's.
Disconnect the Driver Window/Door Lock Switch connector.
Turn the ignition on.
With the scan tool, read DTC's.

Q: Does the scan tool display MEMORY SWITCH INPUT CIRCUIT HIGH?

NO: Replace the Driver Window/Door Lock Switch. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
YES: Go to 3

3. (G161) DRIVER DOOR LOCK SWITCH MUX WIRE SHORT TO VOLTAGE




Disconnect the Driver Memory Mirror Module C1 connector.
Measure the voltage of the (G161) Driver Door Lock Switch Mux circuit in the Driver Memory Mirror Module connector.

Q: Is there any voltage present?

YES: Repair the (G161) Driver Door Lock Switch Mux circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go to 4

4. (P339) MEMORY SELECT SWITCH MUX WIRE SHORT TO VOLTAGE




Disconnect the Driver Memory Mirror Module C2 connector.
Measure the voltage of the (P339) Memory Select Switch Mux circuit.

Q: Is there any voltage present?

YES: Repair the (P339) Memory Select Switch Mux wire for a short to voltage. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Driver Memory Mirror Module. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test