Memory Mirror Module

B1803, B1808 Door Lock/Unlock Switch Circuit Struck Lock - Memory Mirror Module:

B1808 DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK LOCK - MEMORY MIRROR MODULE

For a complete wiring diagram refer to Diagrams/Electrical.

WHEN MONITORED
Continuously

SET CONDITION
When the Door Lock Switch MUX circuit is under 2.6 volts for over 30 seconds.

POSSIBLE CAUSES
- (G161) Driver door lock switch MUX wire partial short to ground
- (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
- Window/door lock switch stuck
- 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
Operate the Door Lock Switch from the side this DTC was set in. Put the switch in both positions several times.
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 DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK LOCK?

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 MODULE OR PASSENGER MODULE

Q: Is this DTC in the Driver or Passenger module?

Passenger GO TO 3
Driver Go to 5

3. PASSENGER DOOR LOCK SWITCH SHORTED TO GROUND




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

Q: Does the scan tool display DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK LOCK?

NO: Replace the Passenger Window/Door Lock Switch. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
YES: Go to 4

4. (G160) PASSENGER DOOR LOCK SWITCH MUX CIRCUIT SHORT TO GROUND




Disconnect the Passenger Memory Mirror Module connector. Measure the resistance between ground and the (G160) Passenger Door Lock Switch MUX circuit in the Passenger Memory Mirror Module connector.

Q: Is the resistance below 10000.0 ohms?

YES: Repair the (G160) Passenger Door Lock Switch MUX circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test NO: Replace the Passenger Memory Mirror Module.

5. DRIVER DOOR LOCK SWITCH SHORTED TO GROUND




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 DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK LOCK?

NO: Replace the Driver Window/Door Lock Switch.Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
YES: Go to 6

6. (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 7

7. MEMORY SELECT MUX WIRE SHORT TO GROUND




Disconnect the Driver Memory Mirror Module C2 connector.
Measure the resistance between ground and the 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 8

8. MEMORY SELECT SWITCH MUX CIRCUIT SHORTED




Measure the resistance between the Memory Select Switch MUX circuit and the Memory Select Switch Return circuit in the Driver Memory Mirror Module C2 connector.

Q: Is the resistance below 10000.0 ohms?

YES: Go to 9
NO: Replace the Driver Memory Mirror Module.Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

9. MEMORY SELECTOR SWITCH SHORTED




Disconnect the Memory Selector Switch connector.
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 the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Memory Selector Switch. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test