DTC P0850:29 [Advanced Keyless Entry And Push Button Start System]: Notes
WARNING: This page is about a different car, the 2010 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0850:29 (ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM) DETECTION CONDITION AND POSSIBLE CAUSE
| DESCRIPTION |
Erratic signal of TR switch |
| DETECTION CONDITION |
- CAN and TR switch signals do not correspond.
- Keyless control module detects that the TR switch stuck off for 5 s
while the ignition is ON.
- Starter monitor input voltage is above the specification when the CAN signal is P or N range
- Keyless control module detects that the TR switch stuck ON for 5 s
while the ignition is ON.
- Starter monitor input voltage is less than the specification when the CAN signal is R or D range,
|
| POSSIBLE CAUSE |
- Starter relay malfunction
- TR switch connector or terminals malfunction
- TR switch malfunction
- Keyless control module connector or terminals malfunction
- Short to ground in wiring harness between the following terminals:
- Starter relay terminal A-Keyless control module terminal 2F
- Starter relay terminal A-TR switch terminal F
- TR switch terminal A-Keyless control module terminal 3T
- Short to power supply in wiring harness between the following terminals:
- Starter relay terminal A-Keyless control module terminal 2F
- Starter relay terminal A-TR switch terminal F
- TR switch terminal A-Keyless control module terminal 3T
- Open circuit in wiring harness between the following terminals:
- Starter relay terminal A-Keyless control module terminal 2F
- Starter relay terminal A-TR switch terminal F
- TR switch terminal A-Keyless control module terminal 3T
- Keyless control module malfunction
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 Courtesy of MAZDA MOTORS CORP.
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